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/*
example.js
 
quickstart example
 
instruction
    1. save this script as example.js
    2. run the shell command:
        $ npm install npmtest-jsdom && PORT=8081 node example.js
    3. play with the browser-demo on http://127.0.0.1:8081
*/
 
 
 
/* istanbul instrument in package npmtest_jsdom */
/*jslint
    bitwise: true,
    browser: true,
    maxerr: 8,
    maxlen: 96,
    node: true,
    nomen: true,
    regexp: true,
    stupid: true
*/
(function () {
    'use strict';
    var local;
 
 
 
    // run shared js-env code - pre-init
    (function () {
        // init local
        local = {};
        // init modeJs
        local.modeJs = (function () {
            try {
                return typeof navigator.userAgent === 'string' &&
                    typeof document.querySelector('body') === 'object' &&
                    typeof XMLHttpRequest.prototype.open === 'function' &&
                    'browser';
            } catch (errorCaughtBrowser) {
                return module.exports &&
                    typeof process.versions.node === 'string' &&
                    typeof require('http').createServer === 'function' &&
                    'node';
            }
        }());
        // init global
        local.global = local.modeJs === 'browser'
            ? window
            : global;
        // init utility2_rollup
        local = local.global.utility2_rollup || (local.modeJs === 'browser'
            ? local.global.utility2_npmtest_jsdom
            : global.utility2_moduleExports);
        // export local
        local.global.local = local;
    }());
    switch (local.modeJs) {
 
 
 
    // post-init
    // run browser js-env code - post-init
    /* istanbul ignore next */
    case 'browser':
        local.testRunBrowser = function (event) {
            Eif (!event || (event &&
                    event.currentTarget &&
                    event.currentTarget.className &&
                    event.currentTarget.className.includes &&
                    event.currentTarget.className.includes('onreset'))) {
                // reset output
                Array.from(
                    document.querySelectorAll('body > .resettable')
                ).forEach(function (element) {
                    switch (element.tagName) {
                    case 'INPUT':
                    case 'TEXTAREA':
                        element.value = '';
                        break;
                    default:
                        element.textContent = '';
                    }
                });
            }
            switch (event && event.currentTarget && event.currentTarget.id) {
            case 'testRunButton1':
                // show tests
                Eif (document.querySelector('#testReportDiv1').style.display === 'none') {
                    document.querySelector('#testReportDiv1').style.display = 'block';
                    document.querySelector('#testRunButton1').textContent =
                        'hide internal test';
                    local.modeTest = true;
                    local.testRunDefault(local);
                // hide tests
                } else {
                    document.querySelector('#testReportDiv1').style.display = 'none';
                    document.querySelector('#testRunButton1').textContent = 'run internal test';
                }
                break;
            // custom-case
            default:
                break;
            }
            Iif (document.querySelector('#inputTextareaEval1') && (!event || (event &&
                    event.currentTarget &&
                    event.currentTarget.className &&
                    event.currentTarget.className.includes &&
                    event.currentTarget.className.includes('oneval')))) {
                // try to eval input-code
                try {
                    /*jslint evil: true*/
                    eval(document.querySelector('#inputTextareaEval1').value);
                } catch (errorCaught) {
                    console.error(errorCaught.stack);
                }
            }
        };
        // log stderr and stdout to #outputTextareaStdout1
        ['error', 'log'].forEach(function (key) {
            console[key + '_original'] = console[key];
            console[key] = function () {
                var element;
                console[key + '_original'].apply(console, arguments);
                element = document.querySelector('#outputTextareaStdout1');
                Iif (!element) {
                    return;
                }
                // append text to #outputTextareaStdout1
                element.value += Array.from(arguments).map(function (arg) {
                    return typeof arg === 'string'
                        ? arg
                        : JSON.stringify(arg, null, 4);
                }).join(' ') + '\n';
                // scroll textarea to bottom
                element.scrollTop = element.scrollHeight;
            };
        });
        // init event-handling
        ['change', 'click', 'keyup'].forEach(function (event) {
            Array.from(document.querySelectorAll('.on' + event)).forEach(function (element) {
                element.addEventListener(event, local.testRunBrowser);
            });
        });
        // run tests
        local.testRunBrowser();
        break;
 
 
 
    // run node js-env code - post-init
    /* istanbul ignore next */
    case 'node':
        // export local
        module.exports = local;
        // require modules
        local.fs = require('fs');
        local.http = require('http');
        local.url = require('url');
        // init assets
        local.assetsDict = local.assetsDict || {};
        /* jslint-ignore-begin */
        local.assetsDict['/assets.index.template.html'] = '\
<!doctype html>\n\
<html lang="en">\n\
<head>\n\
<meta charset="UTF-8">\n\
<meta name="viewport" content="width=device-width, initial-scale=1">\n\
<title>{{env.npm_package_name}} (v{{env.npm_package_version}})</title>\n\
<style>\n\
/*csslint\n\
    box-sizing: false,\n\
    universal-selector: false\n\
*/\n\
* {\n\
    box-sizing: border-box;\n\
}\n\
body {\n\
    background: #dde;\n\
    font-family: Arial, Helvetica, sans-serif;\n\
    margin: 2rem;\n\
}\n\
body > * {\n\
    margin-bottom: 1rem;\n\
}\n\
.utility2FooterDiv {\n\
    margin-top: 20px;\n\
    text-align: center;\n\
}\n\
</style>\n\
<style>\n\
/*csslint\n\
*/\n\
textarea {\n\
    font-family: monospace;\n\
    height: 10rem;\n\
    width: 100%;\n\
}\n\
textarea[readonly] {\n\
    background: #ddd;\n\
}\n\
</style>\n\
</head>\n\
<body>\n\
<!-- utility2-comment\n\
<div id="ajaxProgressDiv1" style="background: #d00; height: 2px; left: 0; margin: 0; padding: 0; position: fixed; top: 0; transition: background 0.5s, width 1.5s; width: 25%;"></div>\n\
utility2-comment -->\n\
<h1>\n\
<!-- utility2-comment\n\
    <a\n\
        {{#if env.npm_package_homepage}}\n\
        href="{{env.npm_package_homepage}}"\n\
        {{/if env.npm_package_homepage}}\n\
        target="_blank"\n\
    >\n\
utility2-comment -->\n\
        {{env.npm_package_name}} (v{{env.npm_package_version}})\n\
<!-- utility2-comment\n\
    </a>\n\
utility2-comment -->\n\
</h1>\n\
<h3>{{env.npm_package_description}}</h3>\n\
<!-- utility2-comment\n\
<h4><a download href="assets.app.js">download standalone app</a></h4>\n\
<button class="onclick onreset" id="testRunButton1">run internal test</button><br>\n\
<div id="testReportDiv1" style="display: none;"></div>\n\
utility2-comment -->\n\
\n\
\n\
\n\
<label>stderr and stdout</label>\n\
<textarea class="resettable" id="outputTextareaStdout1" readonly></textarea>\n\
<!-- utility2-comment\n\
{{#if isRollup}}\n\
<script src="assets.app.js"></script>\n\
{{#unless isRollup}}\n\
utility2-comment -->\n\
<script src="assets.utility2.rollup.js"></script>\n\
<script src="jsonp.utility2._stateInit?callback=window.utility2._stateInit"></script>\n\
<script src="assets.npmtest_jsdom.rollup.js"></script>\n\
<script src="assets.example.js"></script>\n\
<script src="assets.test.js"></script>\n\
<!-- utility2-comment\n\
{{/if isRollup}}\n\
utility2-comment -->\n\
<div class="utility2FooterDiv">\n\
    [ this app was created with\n\
    <a href="https://github.com/kaizhu256/node-utility2" target="_blank">utility2</a>\n\
    ]\n\
</div>\n\
</body>\n\
</html>\n\
';
        /* jslint-ignore-end */
        Iif (local.templateRender) {
            local.assetsDict['/'] = local.templateRender(
                local.assetsDict['/assets.index.template.html'],
                {
                    env: local.objectSetDefault(local.env, {
                        npm_package_description: 'the greatest app in the world!',
                        npm_package_name: 'my-app',
                        npm_package_nameAlias: 'my_app',
                        npm_package_version: '0.0.1'
                    })
                }
            );
        } else {
            local.assetsDict['/'] = local.assetsDict['/assets.index.template.html']
                .replace((/\{\{env\.(\w+?)\}\}/g), function (match0, match1) {
                    // jslint-hack
                    String(match0);
                    switch (match1) {
                    case 'npm_package_description':
                        return 'the greatest app in the world!';
                    case 'npm_package_name':
                        return 'my-app';
                    case 'npm_package_nameAlias':
                        return 'my_app';
                    case 'npm_package_version':
                        return '0.0.1';
                    }
                });
        }
        // run the cli
        Eif (local.global.utility2_rollup || module !== require.main) {
            break;
        }
        local.assetsDict['/assets.example.js'] =
            local.assetsDict['/assets.example.js'] ||
            local.fs.readFileSync(__filename, 'utf8');
        local.assetsDict['/assets.npmtest_jsdom.rollup.js'] =
            local.assetsDict['/assets.npmtest_jsdom.rollup.js'] ||
            local.fs.readFileSync(
                // buildCustomOrg-hack
                local.npmtest_jsdom.__dirname +
                    '/lib.npmtest_jsdom.js',
                'utf8'
            ).replace((/^#!/), '//');
        local.assetsDict['/favicon.ico'] = local.assetsDict['/favicon.ico'] || '';
        // if $npm_config_timeout_exit exists,
        // then exit this process after $npm_config_timeout_exit ms
        if (Number(process.env.npm_config_timeout_exit)) {
            setTimeout(process.exit, Number(process.env.npm_config_timeout_exit));
        }
        // start server
        if (local.global.utility2_serverHttp1) {
            break;
        }
        process.env.PORT = process.env.PORT || '8081';
        console.error('server starting on port ' + process.env.PORT);
        local.http.createServer(function (request, response) {
            request.urlParsed = local.url.parse(request.url);
            if (local.assetsDict[request.urlParsed.pathname] !== undefined) {
                response.end(local.assetsDict[request.urlParsed.pathname]);
                return;
            }
            response.statusCode = 404;
            response.end();
        }).listen(process.env.PORT);
        break;
    }
}());
 
 

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/* istanbul instrument in package npmtest_jsdom */
/*jslint
    bitwise: true,
    browser: true,
    maxerr: 8,
    maxlen: 96,
    node: true,
    nomen: true,
    regexp: true,
    stupid: true
*/
(function () {
    'use strict';
    var local;
 
 
 
    // run shared js-env code - pre-init
    (function () {
        // init local
        local = {};
        // init modeJs
        local.modeJs = (function () {
            try {
                return typeof navigator.userAgent === 'string' &&
                    typeof document.querySelector('body') === 'object' &&
                    typeof XMLHttpRequest.prototype.open === 'function' &&
                    'browser';
            } catch (errorCaughtBrowser) {
                return module.exports &&
                    typeof process.versions.node === 'string' &&
                    typeof require('http').createServer === 'function' &&
                    'node';
            }
        }());
        // init global
        local.global = local.modeJs === 'browser'
            ? window
            : global;
        // init utility2_rollup
        local = local.global.utility2_rollup || local;
        // init lib
        local.local = local.npmtest_jsdom = local;
        // init exports
        if (local.modeJs === 'browser') {
            local.global.utility2_npmtest_jsdom = local;
        } else {
            module.exports = local;
            module.exports.__dirname = __dirname;
            module.exports.module = module;
        }
    }());
}());
 
 

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/* istanbul instrument in package npmtest_jsdom */
/*jslint
    bitwise: true,
    browser: true,
    maxerr: 8,
    maxlen: 96,
    node: true,
    nomen: true,
    regexp: true,
    stupid: true
*/
(function () {
    'use strict';
    var local;
 
 
 
    // run shared js-env code - pre-init
    (function () {
        // init local
        local = {};
        // init modeJs
        local.modeJs = (function () {
            try {
                return typeof navigator.userAgent === 'string' &&
                    typeof document.querySelector('body') === 'object' &&
                    typeof XMLHttpRequest.prototype.open === 'function' &&
                    'browser';
            } catch (errorCaughtBrowser) {
                return module.exports &&
                    typeof process.versions.node === 'string' &&
                    typeof require('http').createServer === 'function' &&
                    'node';
            }
        }());
        // init global
        local.global = local.modeJs === 'browser'
            ? window
            : global;
        switch (local.modeJs) {
        // re-init local from window.local
        case 'browser':
            local = local.global.utility2.objectSetDefault(
                local.global.utility2_rollup || local.global.local,
                local.global.utility2
            );
            break;
        // re-init local from example.js
        case 'node':
            local = (local.global.utility2_rollup || require('utility2'))
                .requireExampleJsFromReadme();
            break;
        }
        // export local
        local.global.local = local;
    }());
 
 
 
    // run shared js-env code - function
    (function () {
        return;
    }());
    switch (local.modeJs) {
 
 
 
    // run browser js-env code - function
    case 'browser':
        break;
 
 
 
    // run node js-env code - function
    case 'node':
        break;
    }
 
 
 
    // run shared js-env code - post-init
    (function () {
        return;
    }());
    switch (local.modeJs) {
 
 
 
    // run browser js-env code - post-init
    case 'browser':
        // run tests
        local.nop(local.modeTest &&
            document.querySelector('#testRunButton1') &&
            document.querySelector('#testRunButton1').click());
        break;
 
 
 
    // run node js-env code - post-init
    /* istanbul ignore next */
    case 'node':
        local.testCase_buildApidoc_default = local.testCase_buildApidoc_default || function (
            options,
            onError
        ) {
        /*
         * this function will test buildApidoc's default handling-behavior-behavior
         */
            options = { modulePathList: module.paths };
            local.buildApidoc(options, onError);
        };
 
        local.testCase_buildApp_default = local.testCase_buildApp_default || function (
            options,
            onError
        ) {
        /*
         * this function will test buildApp's default handling-behavior-behavior
         */
            local.testCase_buildReadme_default(options, local.onErrorThrow);
            local.testCase_buildLib_default(options, local.onErrorThrow);
            local.testCase_buildTest_default(options, local.onErrorThrow);
            options = [];
            local.buildApp(options, onError);
        };
 
        local.testCase_buildLib_default = local.testCase_buildLib_default || function (
            options,
            onError
        ) {
        /*
         * this function will test buildLib's default handling-behavior
         */
            options = {};
            local.buildLib(options, onError);
        };
 
        local.testCase_buildReadme_default = local.testCase_buildReadme_default || function (
            options,
            onError
        ) {
        /*
         * this function will test buildReadme's default handling-behavior-behavior
         */
            options = {};
            local.buildReadme(options, onError);
        };
 
        local.testCase_buildTest_default = local.testCase_buildTest_default || function (
            options,
            onError
        ) {
        /*
         * this function will test buildTest's default handling-behavior
         */
            options = {};
            local.buildTest(options, onError);
        };
 
        local.testCase_webpage_default = local.testCase_webpage_default || function (
            options,
            onError
        ) {
        /*
         * this function will test webpage's default handling-behavior
         */
            options = { modeCoverageMerge: true, url: local.serverLocalHost + '?modeTest=1' };
            local.browserTest(options, onError);
        };
 
        // run test-server
        local.testRunServer(local);
        break;
    }
}());
 
 

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"use strict";
/* eslint-disable no-unused-expressions */
() => `jsdom 7.x onward only works on Node.js 4 or newer: https://github.com/tmpvar/jsdom#install`;
/* eslint-enable no-unused-expressions */
 
const fs = require("fs");
const path = require("path");
const CookieJar = require("tough-cookie").CookieJar;
const parseContentType = require("content-type-parser");
 
const toFileUrl = require("./jsdom/utils").toFileUrl;
const documentFeatures = require("./jsdom/browser/documentfeatures");
const domToHtml = require("./jsdom/browser/domtohtml").domToHtml;
const Window = require("./jsdom/browser/Window");
const resourceLoader = require("./jsdom/browser/resource-loader");
const VirtualConsole = require("./jsdom/virtual-console");
const locationInfo = require("./jsdom/living/helpers/internal-constants").locationInfo;
const idlUtils = require("./jsdom/living/generated/utils");
const Blob = require("./jsdom/living/generated/Blob");
 
const whatwgURL = require("whatwg-url");
 
require("./jsdom/living"); // Enable living standard features
 
/* eslint-disable no-restricted-modules */
// TODO: stop using the built-in URL in favor of the spec-compliant whatwg-url package
// This legacy usage is in the process of being purged.
const URL = require("url");
/* eslint-enable no-restricted-modules */
 
const canReadFilesFromFS = Boolean(fs.readFile); // in a browserify environment, this isn't present
 
exports.createVirtualConsole = function (options) {
  return new VirtualConsole(options);
};
 
exports.getVirtualConsole = function (window) {
  return window._virtualConsole;
};
 
exports.createCookieJar = function () {
  return new CookieJar(null, { looseMode: true });
};
 
exports.nodeLocation = function (node) {
  return idlUtils.implForWrapper(node)[locationInfo];
};
 
exports.reconfigureWindow = function (window, newProps) {
  if ("top" in newProps) {
    window._top = newProps.top;
  }
};
 
exports.changeURL = function (window, urlString) {
  const doc = idlUtils.implForWrapper(window._document);
 
  const url = whatwgURL.parseURL(urlString);
 
  if (url === "failure") {
    throw new TypeError(`Could not parse "${urlString}" as a URL`);
  }
 
  doc._URL = url;
  doc._origin = whatwgURL.serializeURLToUnicodeOrigin(doc._URL);
};
 
// Proxy to features module
Object.defineProperty(exports, "defaultDocumentFeatures", {
  enumerable: true,
  configurable: true,
  get() {
    return documentFeatures.defaultDocumentFeatures;
  },
  set(v) {
    documentFeatures.defaultDocumentFeatures = v;
  }
});
 
exports.jsdom = function (html, options) {
  if (options === undefined) {
    options = {};
  }
  if (options.parsingMode === undefined || options.parsingMode === "auto") {
    options.parsingMode = "html";
  }
 
  if (options.parsingMode !== "html" && options.parsingMode !== "xml") {
    throw new RangeError(`Invalid parsingMode option ${JSON.stringify(options.parsingMode)}; must be either "html", ` +
      `"xml", "auto", or undefined`);
  }
 
  options.encoding = options.encoding || "UTF-8";
 
  setGlobalDefaultConfig(options);
 
  // Back-compat hack: we have previously suggested nesting these under document, for jsdom.env at least.
  // So we need to support that.
  if (options.document) {
    if (options.document.cookie !== undefined) {
      options.cookie = options.document.cookie;
    }
    if (options.document.referrer !== undefined) {
      options.referrer = options.document.referrer;
    }
  }
 
  // List options explicitly to be clear which are passed through
  const window = new Window({
    parsingMode: options.parsingMode,
    contentType: options.contentType,
    encoding: options.encoding,
    parser: options.parser,
    url: options.url,
    lastModified: options.lastModified,
    referrer: options.referrer,
    cookieJar: options.cookieJar,
    cookie: options.cookie,
    resourceLoader: options.resourceLoader,
    deferClose: options.deferClose,
    concurrentNodeIterators: options.concurrentNodeIterators,
    virtualConsole: options.virtualConsole,
    pool: options.pool,
    agent: options.agent,
    agentClass: options.agentClass,
    agentOptions: options.agentOptions,
    strictSSL: options.strictSSL,
    proxy: options.proxy,
    userAgent: options.userAgent
  });
 
  const documentImpl = idlUtils.implForWrapper(window.document);
  documentFeatures.applyDocumentFeatures(documentImpl, options.features);
 
  if (options.created) {
    options.created(null, window.document.defaultView);
  }
 
  if (options.parsingMode === "html") {
    if (html === undefined || html === "") {
      html = "<html><head></head><body></body></html>";
    }
 
    window.document.write(html);
  } else if (options.parsingMode === "xml") {
    if (html !== undefined) {
      documentImpl._htmlToDom.appendHtmlToDocument(html, documentImpl);
    }
  }
 
  if (window.document.close && !options.deferClose) {
    window.document.close();
  }
 
  return window.document;
};
 
exports.jQueryify = exports.jsdom.jQueryify = function (window, jqueryUrl, callback) {
  if (!window || !window.document) {
    return;
  }
 
  const implImpl = idlUtils.implForWrapper(window.document.implementation);
  const features = implImpl._features;
  implImpl._addFeature("FetchExternalResources", ["script"]);
  implImpl._addFeature("ProcessExternalResources", ["script"]);
 
  const scriptEl = window.document.createElement("script");
  scriptEl.className = "jsdom";
  scriptEl.src = jqueryUrl;
  scriptEl.onload = scriptEl.onerror = () => {
    implImpl._features = features;
 
    if (callback) {
      callback(window, window.jQuery);
    }
  };
 
  window.document.body.appendChild(scriptEl);
};
 
exports.env = exports.jsdom.env = function () {
  const config = getConfigFromArguments(arguments);
  let req = null;
 
  if (config.file && canReadFilesFromFS) {
    req = resourceLoader.readFile(config.file,
    { defaultEncoding: config.defaultEncoding, detectMetaCharset: true },
    (err, text, res) => {
      if (err) {
        reportInitError(err, config);
        return;
      }
 
      const contentType = parseContentType(res.headers["content-type"]);
      config.encoding = contentType.get("charset");
      setParsingModeFromExtension(config, config.file);
 
      config.html = text;
      processHTML(config);
    });
  } else if (config.html !== undefined) {
    processHTML(config);
  } else if (config.url) {
    req = handleUrl(config);
  } else if (config.somethingToAutodetect !== undefined) {
    const url = URL.parse(config.somethingToAutodetect);
    if (url.protocol && url.hostname) {
      config.url = config.somethingToAutodetect;
      req = handleUrl(config.somethingToAutodetect);
    } else if (canReadFilesFromFS) {
      req = resourceLoader.readFile(config.somethingToAutodetect,
      { defaultEncoding: config.defaultEncoding, detectMetaCharset: true },
      (err, text, res) => {
        if (err) {
          if (err.code === "ENOENT" || err.code === "ENAMETOOLONG") {
            config.html = config.somethingToAutodetect;
            processHTML(config);
          } else {
            reportInitError(err, config);
          }
        } else {
          const contentType = parseContentType(res.headers["content-type"]);
          config.encoding = contentType.get("charset");
          setParsingModeFromExtension(config, config.somethingToAutodetect);
 
          config.html = text;
          config.url = toFileUrl(config.somethingToAutodetect);
          processHTML(config);
        }
      });
    } else {
      config.html = config.somethingToAutodetect;
      processHTML(config);
    }
  }
 
  function handleUrl() {
    config.cookieJar = config.cookieJar || exports.createCookieJar();
 
    const options = {
      defaultEncoding: config.defaultEncoding,
      detectMetaCharset: true,
      headers: config.headers,
      pool: config.pool,
      strictSSL: config.strictSSL,
      proxy: config.proxy,
      cookieJar: config.cookieJar,
      userAgent: config.userAgent,
      agent: config.agent,
      agentClass: config.agentClass,
      agentOptions: config.agentOptions
    };
 
    const fragment = whatwgURL.parseURL(config.url).fragment;
 
    return resourceLoader.download(config.url, options, (err, responseText, res) => {
      if (err) {
        reportInitError(err, config);
        return;
      }
 
      // The use of `res.request.uri.href` ensures that `window.location.href`
      // is updated when `request` follows redirects.
      config.html = responseText;
      config.url = res.request.uri.href;
      if (fragment) {
        config.url += `#${fragment}`;
      }
 
      if (res.headers["last-modified"]) {
        config.lastModified = new Date(res.headers["last-modified"]);
      }
 
      const contentType = parseContentType(res.headers["content-type"]);
      if (config.parsingMode === "auto") {
        if (contentType.isXML()) {
          config.parsingMode = "xml";
        }
      }
      config.encoding = contentType.get("charset");
 
      processHTML(config);
    });
  }
  return req;
};
 
exports.serializeDocument = function (doc) {
  return domToHtml([doc]);
};
 
exports.blobToBuffer = function (blob) {
  return Blob.is(blob) && idlUtils.implForWrapper(blob)._buffer || undefined;
};
 
exports.evalVMScript = (window, script) => {
  return script.runInContext(idlUtils.implForWrapper(window._document)._global);
};
 
function processHTML(config) {
  const window = exports.jsdom(config.html, config).defaultView;
  const implImpl = idlUtils.implForWrapper(window.document.implementation);
  const features = JSON.parse(JSON.stringify(implImpl._features));
 
  let docsLoaded = 0;
  const totalDocs = config.scripts.length + config.src.length;
 
  if (!window || !window.document) {
    reportInitError(new Error("JSDOM: a window object could not be created."), config);
    return;
  }
 
  function scriptComplete() {
    docsLoaded++;
 
    if (docsLoaded >= totalDocs) {
      implImpl._features = features;
 
      process.nextTick(() => {
        if (config.onload) {
          config.onload(window);
        }
        if (config.done) {
          config.done(null, window);
        }
      });
    }
  }
 
  function handleScriptError() {
    // nextTick so that an exception within scriptComplete won't cause
    // another script onerror (which would be an infinite loop)
    process.nextTick(scriptComplete);
  }
 
  if (config.scripts.length > 0 || config.src.length > 0) {
    implImpl._addFeature("FetchExternalResources", ["script"]);
    implImpl._addFeature("ProcessExternalResources", ["script"]);
 
    for (const scriptSrc of config.scripts) {
      const script = window.document.createElement("script");
      script.className = "jsdom";
      script.onload = scriptComplete;
      script.onerror = handleScriptError;
      script.src = scriptSrc;
 
      window.document.body.appendChild(script);
    }
 
    for (const scriptText of config.src) {
      const script = window.document.createElement("script");
      script.onload = scriptComplete;
      script.onerror = handleScriptError;
      script.text = scriptText;
 
      window.document.documentElement.appendChild(script);
      window.document.documentElement.removeChild(script);
    }
  } else if (window.document.readyState === "complete") {
    scriptComplete();
  } else {
    window.addEventListener("load", scriptComplete);
  }
}
 
function setGlobalDefaultConfig(config) {
  config.pool = config.pool !== undefined ? config.pool : {
    maxSockets: 6
  };
 
  config.agentOptions = config.agentOptions !== undefined ? config.agentOptions : {
    keepAlive: true,
    keepAliveMsecs: 115 * 1000
  };
 
  config.strictSSL = config.strictSSL !== undefined ? config.strictSSL : true;
 
  config.userAgent = config.userAgent ||
    `Node.js (${process.platform}; U; rv:${process.version}) AppleWebKit/537.36 (KHTML, like Gecko)`;
}
 
function getConfigFromArguments(args) {
  const config = {};
  if (typeof args[0] === "object") {
    Object.assign(config, args[0]);
  } else {
    for (const arg of args) {
      switch (typeof arg) {
        case "string":
          config.somethingToAutodetect = arg;
          break;
        case "function":
          config.done = arg;
          break;
        case "object":
          if (Array.isArray(arg)) {
            config.scripts = arg;
          } else {
            Object.assign(config, arg);
          }
          break;
      }
    }
  }
 
  if (!config.done && !config.created && !config.onload) {
    throw new Error("Must pass a \"created\", \"onload\", or \"done\" option, or a callback, to jsdom.env");
  }
 
  if (config.somethingToAutodetect === undefined &&
      config.html === undefined && !config.file && !config.url) {
    throw new Error("Must pass a \"html\", \"file\", or \"url\" option, or a string, to jsdom.env");
  }
 
  config.scripts = ensureArray(config.scripts);
  config.src = ensureArray(config.src);
  config.parsingMode = config.parsingMode || "auto";
 
  config.features = config.features || {
    FetchExternalResources: false,
    ProcessExternalResources: false,
    SkipExternalResources: false
  };
 
  if (!config.url && config.file) {
    config.url = toFileUrl(config.file);
  }
 
  config.defaultEncoding = config.defaultEncoding || "windows-1252";
 
  setGlobalDefaultConfig(config);
 
  return config;
}
 
function reportInitError(err, config) {
  if (config.created) {
    config.created(err);
  }
  if (config.done) {
    config.done(err);
  }
}
 
function ensureArray(value) {
  let array = value || [];
  if (typeof array === "string") {
    array = [array];
  }
  return array;
}
 
function setParsingModeFromExtension(config, filename) {
  if (config.parsingMode === "auto") {
    const ext = path.extname(filename);
    if (ext === ".xhtml" || ext === ".xml") {
      config.parsingMode = "xml";
    }
  }
}
 
 

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"use strict";
// https://heycam.github.io/webidl/#idl-named-properties
 
const IS_NAMED_PROPERTY = Symbol();
const TRACKER = Symbol();
 
/**
 * Create a new NamedPropertiesTracker for the given `object`.
 *
 * Named properties are used in DOM to let you lookup (for example) a Node by accessing a property on another object.
 * For example `window.foo` might resolve to an image element with id "foo".
 *
 * This tracker is a workaround because the ES6 Proxy feature is not yet available.
 *
 * @param {Object} object
 * @param {Function} resolverFunc Each time a property is accessed, this function is called to determine the value of
 *        the property. The function is passed 3 arguments: (object, name, values).
 *        `object` is identical to the `object` parameter of this `create` function.
 *        `name` is the name of the property.
 *        `values` is a function that returns a Set with all the tracked values for this name. The order of these
 *        values is undefined.
 *
 * @returns {NamedPropertiesTracker}
 */
exports.create = function (object, resolverFunc) {
  if (object[TRACKER]) {
    throw Error("A NamedPropertiesTracker has already been created for this object");
  }
 
  const tracker = new NamedPropertiesTracker(object, resolverFunc);
  object[TRACKER] = tracker;
  return tracker;
};
 
exports.get = function (object) {
  if (!object) {
    return null;
  }
 
  return object[TRACKER] || null;
};
 
function NamedPropertiesTracker(object, resolverFunc) {
  this.object = object;
  this.resolverFunc = resolverFunc;
  this.trackedValues = new Map(); // Map<Set<value>>
}
 
function newPropertyDescriptor(tracker, name) {
  const emptySet = new Set();
 
  function getValues() {
    return tracker.trackedValues.get(name) || emptySet;
  }
 
  const descriptor = {
    enumerable: true,
    configurable: true,
    get() {
      return tracker.resolverFunc(tracker.object, name, getValues);
    },
    set(value) {
      Object.defineProperty(tracker.object, name, {
        enumerable: true,
        configurable: true,
        writable: true,
        value
      });
    }
  };
 
  descriptor.get[IS_NAMED_PROPERTY] = true;
  descriptor.set[IS_NAMED_PROPERTY] = true;
  return descriptor;
}
 
/**
 * Track a value (e.g. a Node) for a specified name.
 *
 * Values can be tracked eagerly, which means that not all tracked values *have* to appear in the output. The resolver
 * function that was passed to the output may filter the value.
 *
 * Tracking the same `name` and `value` pair multiple times has no effect
 *
 * @param {String} name
 * @param {*} value
 */
NamedPropertiesTracker.prototype.track = function (name, value) {
  if (name === undefined || name === null || name === "") {
    return;
  }
 
  let valueSet = this.trackedValues.get(name);
  if (!valueSet) {
    valueSet = new Set();
    this.trackedValues.set(name, valueSet);
  }
 
  valueSet.add(value);
 
  if (name in this.object) {
    // already added our getter or it is not a named property (e.g. "addEventListener")
    return;
  }
 
  const descriptor = newPropertyDescriptor(this, name);
  Object.defineProperty(this.object, name, descriptor);
};
 
/**
 * Stop tracking a previously tracked `name` & `value` pair, see track().
 *
 * Untracking the same `name` and `value` pair multiple times has no effect
 *
 * @param {String} name
 * @param {*} value
 */
NamedPropertiesTracker.prototype.untrack = function (name, value) {
  if (name === undefined || name === null || name === "") {
    return;
  }
 
  const valueSet = this.trackedValues.get(name);
  if (!valueSet) {
    // the value is not present
    return;
  }
 
  if (!valueSet.delete(value)) {
    // the value was not present
    return;
  }
 
  if (valueSet.size === 0) {
    this.trackedValues.delete(name);
  }
 
  if (valueSet.size > 0) {
    // other values for this name are still present
    return;
  }
 
  // at this point there are no more values, delete the property
 
  const descriptor = Object.getOwnPropertyDescriptor(this.object, name);
 
  if (!descriptor || !descriptor.get || descriptor.get[IS_NAMED_PROPERTY] !== true) {
    // Not defined by NamedPropertyTracker
    return;
  }
 
  // note: delete puts the object in dictionary mode.
  // if this turns out to be a performance issue, maybe add:
  // https://github.com/petkaantonov/bluebird/blob/3e36fc861ac5795193ba37935333eb6ef3716390/src/util.js#L177
  delete this.object[name];
};
 
 

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"use strict";
const path = require("path");
const whatwgURL = require("whatwg-url");
const querystring = require("querystring");
const domSymbolTree = require("./living/helpers/internal-constants").domSymbolTree;
const SYMBOL_TREE_POSITION = require("symbol-tree").TreePosition;
const parseURLToResultingURLRecord = require("./living/helpers/document-base-url").parseURLToResultingURLRecord;
 
exports.toFileUrl = function (fileName) {
  // Beyond just the `path.resolve`, this is mostly for the benefit of Windows,
  // where we need to convert "\" to "/" and add an extra "/" prefix before the
  // drive letter.
  let pathname = path.resolve(process.cwd(), fileName).replace(/\\/g, "/");
  if (pathname[0] !== "/") {
    pathname = "/" + pathname;
  }
 
  // path might contain spaces, so convert those to %20
  return "file://" + encodeURI(pathname);
};
 
/**
 * Define a getter on an object
 *
 * This method replaces any existing getter but leaves setters in place.
 *
 * - `object` {Object} the object to define the getter on
 * - `property` {String} the name of the getter
 * - `getterFn` {Function} the getter
 */
exports.defineGetter = function defineGetter(object, property, getterFn) {
  const descriptor = Object.getOwnPropertyDescriptor(object, property) || {
    configurable: true,
    enumerable: true
  };
 
  descriptor.get = getterFn;
 
  Object.defineProperty(object, property, descriptor);
};
 
/**
 * Define a set of properties on an object, by copying the property descriptors
 * from the original object.
 *
 * - `object` {Object} the target object
 * - `properties` {Object} the source from which to copy property descriptors
 */
exports.define = function define(object, properties) {
  for (const name of Object.getOwnPropertyNames(properties)) {
    const propDesc = Object.getOwnPropertyDescriptor(properties, name);
    Object.defineProperty(object, name, propDesc);
  }
};
 
/**
 * Define a list of constants on a constructor and its .prototype
 *
 * - `Constructor` {Function} the constructor to define the constants on
 * - `propertyMap` {Object}  key/value map of properties to define
 */
exports.addConstants = function addConstants(Constructor, propertyMap) {
  for (const property in propertyMap) {
    const value = propertyMap[property];
    addConstant(Constructor, property, value);
    addConstant(Constructor.prototype, property, value);
  }
};
 
function addConstant(object, property, value) {
  Object.defineProperty(object, property, {
    configurable: false,
    enumerable: true,
    writable: false,
    value
  });
}
 
let memoizeQueryTypeCounter = 0;
 
/**
 * Returns a version of a method that memoizes specific types of calls on the object
 *
 * - `fn` {Function} the method to be memozied
 */
exports.memoizeQuery = function memoizeQuery(fn) {
  // Only memoize query functions with arity <= 2
  Iif (fn.length > 2) {
    return fn;
  }
 
  const type = memoizeQueryTypeCounter++;
 
  return function () {
    if (!this._memoizedQueries) {
      return fn.apply(this, arguments);
    }
 
    if (!this._memoizedQueries[type]) {
      this._memoizedQueries[type] = Object.create(null);
    }
 
    let key;
    if (arguments.length === 1 && typeof arguments[0] === "string") {
      key = arguments[0];
    } else if (arguments.length === 2 && typeof arguments[0] === "string" && typeof arguments[1] === "string") {
      key = arguments[0] + "::" + arguments[1];
    } else {
      return fn.apply(this, arguments);
    }
 
    if (!(key in this._memoizedQueries[type])) {
      this._memoizedQueries[type][key] = fn.apply(this, arguments);
    }
    return this._memoizedQueries[type][key];
  };
};
 
exports.reflectURLAttribute = (elementImpl, contentAttributeName) => {
  const attributeValue = elementImpl.getAttribute(contentAttributeName);
  if (attributeValue === null || attributeValue === "") {
    return "";
  }
 
  const urlRecord = parseURLToResultingURLRecord(attributeValue, elementImpl._ownerDocument);
  if (urlRecord === "failure") {
    return attributeValue;
  }
  return whatwgURL.serializeURL(urlRecord);
};
 
function isValidAbsoluteURL(str) {
  return whatwgURL.parseURL(str) !== "failure";
}
 
exports.isValidTargetOrigin = function (str) {
  return str === "*" || str === "/" || isValidAbsoluteURL(str);
};
 
exports.simultaneousIterators = function* (first, second) {
  for (;;) {
    const firstResult = first.next();
    const secondResult = second.next();
 
    if (firstResult.done && secondResult.done) {
      return;
    }
 
    yield [
      firstResult.done ? null : firstResult.value,
      secondResult.done ? null : secondResult.value
    ];
  }
};
 
exports.treeOrderSorter = function (a, b) {
  const compare = domSymbolTree.compareTreePosition(a, b);
 
  if (compare & SYMBOL_TREE_POSITION.PRECEDING) { // b is preceding a
    return 1;
  }
 
  if (compare & SYMBOL_TREE_POSITION.FOLLOWING) {
    return -1;
  }
 
  // disconnected or equal:
  return 0;
};
 
exports.lengthFromProperties = function (arrayLike) {
  let max = -1;
  const keys = Object.keys(arrayLike);
  const highestKeyIndex = keys.length - 1;
 
  // Abuses a v8 implementation detail for a very fast case
  // (if this implementation detail changes, this method will still
  //  return correct results)
  /* eslint-disable eqeqeq */
  if (highestKeyIndex == keys[highestKeyIndex]) { // not ===
    /* eslint-enable eqeqeq */
    return keys.length;
  }
 
  for (let i = highestKeyIndex; i >= 0; --i) {
    const asNumber = Number(keys[i]);
 
    if (!Number.isNaN(asNumber) && asNumber > max) {
      max = asNumber;
    }
  }
  return max + 1;
};
 
const base64Regexp = /^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/i;
 
exports.parseDataUrl = function parseDataUrl(url) {
  const urlParts = url.match(/^data:(.+?)(?:;(base64))?,(.*)$/);
  let buffer;
  if (urlParts[2] === "base64") {
    if (urlParts[3] && !base64Regexp.test(urlParts[3])) {
      throw new Error("Not a base64 string");
    }
    buffer = new Buffer(urlParts[3], "base64");
  } else {
    buffer = new Buffer(querystring.unescape(urlParts[3]));
  }
  return { buffer, type: urlParts[1] };
};
 
/* eslint-disable global-require */
 
exports.Canvas = null;
["canvas", "canvas-prebuilt"].some(moduleName => {
  try {
    exports.Canvas = require(moduleName);
    if (typeof exports.Canvas !== "function") {
      // In browserify, the require will succeed but return an empty object
      exports.Canvas = null;
    }
  } catch (e) {
    exports.Canvas = null;
  }
  return exports.Canvas !== null;
});
 
 

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"use strict";
const EventEmitter = require("events").EventEmitter;
 
module.exports = class VirtualConsole extends EventEmitter {
  constructor() {
    super();
 
    this.on("error", () => {
      // If "error" event has no listeners,
      // EventEmitter throws an exception
    });
  }
 
  sendTo(anyConsole, options) {
    if (options === undefined) {
      options = {};
    }
 
    for (const method of Object.keys(anyConsole)) {
      if (typeof anyConsole[method] === "function") {
        function onMethodCall() {
          anyConsole[method].apply(anyConsole, arguments);
        }
        this.on(method, onMethodCall);
      }
    }
 
    if (!options.omitJsdomErrors) {
      this.on("jsdomError", e => anyConsole.error(e.stack, e.detail));
    }
 
    return this;
  }
};
 
 

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"use strict";
 
const webIDLConversions = require("webidl-conversions");
const CSSStyleDeclaration = require("cssstyle").CSSStyleDeclaration;
const notImplemented = require("./not-implemented");
const VirtualConsole = require("../virtual-console");
const define = require("../utils").define;
const EventTarget = require("../living/generated/EventTarget");
const namedPropertiesWindow = require("../living/named-properties-window");
const cssom = require("cssom");
const postMessage = require("../living/post-message");
const DOMException = require("../web-idl/DOMException");
const btoa = require("abab").btoa;
const atob = require("abab").atob;
const idlUtils = require("../living/generated/utils");
const createXMLHttpRequest = require("../living/xmlhttprequest");
const createFileReader = require("../living/generated/FileReader").createInterface;
const Document = require("../living/generated/Document");
const Navigator = require("../living/generated/Navigator");
const reportException = require("../living/helpers/runtime-script-errors");
 
// NB: the require() must be after assigning `module.exports` because this require() is circular
// TODO: this above note might not even be true anymore... figure out the cycle and document it, or clean up.
module.exports = Window;
const dom = require("../living");
 
const cssSelectorSplitRE = /((?:[^,"']|"[^"]*"|'[^']*')+)/;
 
const defaultStyleSheet = cssom.parse(require("./default-stylesheet"));
 
dom.Window = Window;
 
// NOTE: per https://heycam.github.io/webidl/#Global, all properties on the Window object must be own-properties.
// That is why we assign everything inside of the constructor, instead of using a shared prototype.
// You can verify this in e.g. Firefox or Internet Explorer, which do a good job with Web IDL compliance.
 
function Window(options) {
  EventTarget.setup(this);
 
  const window = this;
 
  ///// INTERFACES FROM THE DOM
  // TODO: consider a mode of some sort where these are not shared between all DOM instances
  // It'd be very memory-expensive in most cases, though.
  for (const name in dom) {
    Object.defineProperty(window, name, {
      enumerable: false,
      configurable: true,
      writable: true,
      value: dom[name]
    });
  }
  this._core = dom;
 
  ///// PRIVATE DATA PROPERTIES
 
  // vm initialization is defered until script processing is activated (in level1/core)
  this._globalProxy = this;
 
  this.__timers = Object.create(null);
 
  // Set up the window as if it's a top level window.
  // If it's not, then references will be corrected by frame/iframe code.
  this._parent = this._top = this._globalProxy;
  this._frameElement = null;
 
  // List options explicitly to be clear which are passed through
  this._document = Document.create([], {
    core: dom,
    options: {
      parsingMode: options.parsingMode,
      contentType: options.contentType,
      encoding: options.encoding,
      cookieJar: options.cookieJar,
      parser: options.parser,
      url: options.url,
      lastModified: options.lastModified,
      referrer: options.referrer,
      cookie: options.cookie,
      deferClose: options.deferClose,
      resourceLoader: options.resourceLoader,
      concurrentNodeIterators: options.concurrentNodeIterators,
      pool: options.pool,
      agent: options.agent,
      agentClass: options.agentClass,
      agentOptions: options.agentOptions,
      strictSSL: options.strictSSL,
      proxy: options.proxy,
      defaultView: this._globalProxy,
      global: this
    }
  });
  // https://html.spec.whatwg.org/#session-history
  this._sessionHistory = [{
    document: idlUtils.implForWrapper(this._document),
    url: idlUtils.implForWrapper(this._document)._URL,
    stateObject: null
  }];
  this._currentSessionHistoryEntryIndex = 0;
 
 
  // This implements window.frames.length, since window.frames returns a
  // self reference to the window object.  This value is incremented in the
  // HTMLFrameElement init function (see: level2/html.js).
  this._length = 0;
 
  if (options.virtualConsole) {
    if (options.virtualConsole instanceof VirtualConsole) {
      this._virtualConsole = options.virtualConsole;
    } else {
      throw new TypeError(
        "options.virtualConsole must be a VirtualConsole (from createVirtualConsole)");
    }
  } else {
    this._virtualConsole = new VirtualConsole();
  }
 
  ///// GETTERS
 
  const navigator = Navigator.create([], { userAgent: options.userAgent });
 
  define(this, {
    get length() {
      return window._length;
    },
    get window() {
      return window._globalProxy;
    },
    get frameElement() {
      return window._frameElement;
    },
    get frames() {
      return window._globalProxy;
    },
    get self() {
      return window._globalProxy;
    },
    get parent() {
      return window._parent;
    },
    get top() {
      return window._top;
    },
    get document() {
      return window._document;
    },
    get location() {
      return idlUtils.wrapperForImpl(idlUtils.implForWrapper(window._document)._location);
    },
    get history() {
      return idlUtils.wrapperForImpl(idlUtils.implForWrapper(window._document)._history);
    },
    get navigator() {
      return navigator;
    }
  });
 
  namedPropertiesWindow.initializeWindow(this, dom.HTMLCollection);
 
  ///// METHODS for [ImplicitThis] hack
  // See https://lists.w3.org/Archives/Public/public-script-coord/2015JanMar/0109.html
  this.addEventListener = this.addEventListener.bind(this);
  this.removeEventListener = this.removeEventListener.bind(this);
  this.dispatchEvent = this.dispatchEvent.bind(this);
 
  ///// METHODS
 
  let latestTimerId = 0;
 
  this.setTimeout = function (fn, ms) {
    const args = [];
    for (let i = 2; i < arguments.length; ++i) {
      args[i - 2] = arguments[i];
    }
    return startTimer(window, setTimeout, clearTimeout, ++latestTimerId, fn, ms, args);
  };
  this.setInterval = function (fn, ms) {
    const args = [];
    for (let i = 2; i < arguments.length; ++i) {
      args[i - 2] = arguments[i];
    }
    return startTimer(window, setInterval, clearInterval, ++latestTimerId, fn, ms, args);
  };
  this.clearInterval = stopTimer.bind(this, window);
  this.clearTimeout = stopTimer.bind(this, window);
  this.__stopAllTimers = stopAllTimers.bind(this, window);
 
  function Option(text, value, defaultSelected, selected) {
    if (text === undefined) {
      text = "";
    }
    text = webIDLConversions.DOMString(text);
 
    if (value !== undefined) {
      value = webIDLConversions.DOMString(value);
    }
 
    defaultSelected = webIDLConversions.boolean(defaultSelected);
    selected = webIDLConversions.boolean(selected);
 
    const option = window._document.createElement("option");
    const impl = idlUtils.implForWrapper(option);
 
    if (text !== "") {
      impl.text = text;
    }
    if (value !== undefined) {
      impl.setAttribute("value", value);
    }
    if (defaultSelected) {
      impl.setAttribute("selected", "");
    }
    impl._selectedness = selected;
 
    return option;
  }
  Object.defineProperty(Option, "prototype", {
    value: this.HTMLOptionElement.prototype,
    configurable: false,
    enumerable: false,
    writable: false
  });
  Object.defineProperty(window, "Option", {
    value: Option,
    configurable: true,
    enumerable: false,
    writable: true
  });
 
  function Image() {
    const img = window._document.createElement("img");
    const impl = idlUtils.implForWrapper(img);
 
    if (arguments.length > 0) {
      impl.setAttribute("width", String(arguments[0]));
    }
    if (arguments.length > 1) {
      impl.setAttribute("height", String(arguments[1]));
    }
 
    return img;
  }
  Object.defineProperty(Image, "prototype", {
    value: this.HTMLImageElement.prototype,
    configurable: false,
    enumerable: false,
    writable: false
  });
  Object.defineProperty(window, "Image", {
    value: Image,
    configurable: true,
    enumerable: false,
    writable: true
  });
 
  function Audio(src) {
    const audio = window._document.createElement("audio");
    const impl = idlUtils.implForWrapper(audio);
    impl.setAttribute("preload", "auto");
 
    if (src !== undefined) {
      impl.setAttribute("src", String(src));
    }
 
    return audio;
  }
  Object.defineProperty(Audio, "prototype", {
    value: this.HTMLAudioElement.prototype,
    configurable: false,
    enumerable: false,
    writable: false
  });
  Object.defineProperty(window, "Audio", {
    value: Audio,
    configurable: true,
    enumerable: false,
    writable: true
  });
 
  function wrapConsoleMethod(method) {
    return function () {
      const args = Array.prototype.slice.call(arguments);
      window._virtualConsole.emit.apply(window._virtualConsole, [method].concat(args));
    };
  }
 
  this.postMessage = postMessage;
 
  this.atob = function (str) {
    const result = atob(str);
    if (result === null) {
      throw new DOMException(DOMException.INVALID_CHARACTER_ERR,
        "The string to be decoded contains invalid characters.");
    }
    return result;
  };
 
  this.btoa = function (str) {
    const result = btoa(str);
    if (result === null) {
      throw new DOMException(DOMException.INVALID_CHARACTER_ERR,
        "The string to be encoded contains invalid characters.");
    }
    return result;
  };
 
  this.FileReader = createFileReader({
    window: this
  }).interface;
 
  this.XMLHttpRequest = createXMLHttpRequest(this);
 
  // TODO: necessary for Blob and FileReader due to different-globals weirdness; investigate how to avoid this.
  this.ArrayBuffer = ArrayBuffer;
  this.Int8Array = Int8Array;
  this.Uint8Array = Uint8Array;
  this.Uint8ClampedArray = Uint8ClampedArray;
  this.Int16Array = Int16Array;
  this.Uint16Array = Uint16Array;
  this.Int32Array = Int32Array;
  this.Uint32Array = Uint32Array;
  this.Float32Array = Float32Array;
  this.Float64Array = Float64Array;
 
  this.stop = function () {
    const manager = idlUtils.implForWrapper(this._document)._requestManager;
    if (manager) {
      manager.close();
    }
  };
 
  this.close = function () {
    // Recursively close child frame windows, then ourselves.
    const currentWindow = this;
    (function windowCleaner(windowToClean) {
      for (let i = 0; i < windowToClean.length; i++) {
        windowCleaner(windowToClean[i]);
      }
 
      // We"re already in our own window.close().
      if (windowToClean !== currentWindow) {
        windowToClean.close();
      }
    }(this));
 
    // Clear out all listeners. Any in-flight or upcoming events should not get delivered.
    idlUtils.implForWrapper(this)._eventListeners = Object.create(null);
 
    if (this._document) {
      if (this._document.body) {
        this._document.body.innerHTML = "";
      }
 
      if (this._document.close) {
        // It's especially important to clear out the listeners here because document.close() causes a "load" event to
        // fire.
        idlUtils.implForWrapper(this._document)._eventListeners = Object.create(null);
        this._document.close();
      }
      const doc = idlUtils.implForWrapper(this._document);
      if (doc._requestManager) {
        doc._requestManager.close();
      }
      delete this._document;
    }
 
    stopAllTimers(currentWindow);
  };
 
  this.getComputedStyle = function (node) {
    const s = node.style;
    const cs = new CSSStyleDeclaration();
    const forEach = Array.prototype.forEach;
 
    function setPropertiesFromRule(rule) {
      if (!rule.selectorText) {
        return;
      }
 
      const selectors = rule.selectorText.split(cssSelectorSplitRE);
      let matched = false;
      for (const selectorText of selectors) {
        if (selectorText !== "" && selectorText !== "," && !matched && matchesDontThrow(node, selectorText)) {
          matched = true;
          forEach.call(rule.style, property => {
            cs.setProperty(property, rule.style.getPropertyValue(property), rule.style.getPropertyPriority(property));
          });
        }
      }
    }
 
    function readStylesFromStyleSheet(sheet) {
      forEach.call(sheet.cssRules, rule => {
        if (rule.media) {
          if (Array.prototype.indexOf.call(rule.media, "screen") !== -1) {
            forEach.call(rule.cssRules, setPropertiesFromRule);
          }
        } else {
          setPropertiesFromRule(rule);
        }
      });
    }
 
    readStylesFromStyleSheet(defaultStyleSheet);
    forEach.call(node.ownerDocument.styleSheets, readStylesFromStyleSheet);
 
    forEach.call(s, property => {
      cs.setProperty(property, s.getPropertyValue(property), s.getPropertyPriority(property));
    });
 
    return cs;
  };
 
  ///// PUBLIC DATA PROPERTIES (TODO: should be getters)
 
  this.console = {
    assert: wrapConsoleMethod("assert"),
    clear: wrapConsoleMethod("clear"),
    count: wrapConsoleMethod("count"),
    debug: wrapConsoleMethod("debug"),
    error: wrapConsoleMethod("error"),
    group: wrapConsoleMethod("group"),
    groupCollapsed: wrapConsoleMethod("groupCollapsed"),
    groupEnd: wrapConsoleMethod("groupEnd"),
    info: wrapConsoleMethod("info"),
    log: wrapConsoleMethod("log"),
    table: wrapConsoleMethod("table"),
    time: wrapConsoleMethod("time"),
    timeEnd: wrapConsoleMethod("timeEnd"),
    trace: wrapConsoleMethod("trace"),
    warn: wrapConsoleMethod("warn")
  };
 
  function notImplementedMethod(name) {
    return function () {
      notImplemented(name, window);
    };
  }
 
  define(this, {
    name: "nodejs",
    innerWidth: 1024,
    innerHeight: 768,
    outerWidth: 1024,
    outerHeight: 768,
    pageXOffset: 0,
    pageYOffset: 0,
    screenX: 0,
    screenY: 0,
    screenLeft: 0,
    screenTop: 0,
    scrollX: 0,
    scrollY: 0,
    scrollTop: 0,
    scrollLeft: 0,
    screen: {
      width: 0,
      height: 0
    },
 
    alert: notImplementedMethod("window.alert"),
    blur: notImplementedMethod("window.blur"),
    confirm: notImplementedMethod("window.confirm"),
    createPopup: notImplementedMethod("window.createPopup"),
    focus: notImplementedMethod("window.focus"),
    moveBy: notImplementedMethod("window.moveBy"),
    moveTo: notImplementedMethod("window.moveTo"),
    open: notImplementedMethod("window.open"),
    print: notImplementedMethod("window.print"),
    prompt: notImplementedMethod("window.prompt"),
    resizeBy: notImplementedMethod("window.resizeBy"),
    resizeTo: notImplementedMethod("window.resizeTo"),
    scroll: notImplementedMethod("window.scroll"),
    scrollBy: notImplementedMethod("window.scrollBy"),
    scrollTo: notImplementedMethod("window.scrollTo"),
 
    toString: () => {
      return "[object Window]";
    }
  });
 
  ///// INITIALIZATION
 
  process.nextTick(() => {
    if (!window.document) {
      return; // window might've been closed already
    }
 
    if (window.document.readyState === "complete") {
      const ev = window.document.createEvent("HTMLEvents");
      ev.initEvent("load", false, false);
      window.dispatchEvent(ev);
    } else {
      window.document.addEventListener("load", () => {
        const ev = window.document.createEvent("HTMLEvents");
        ev.initEvent("load", false, false);
        window.dispatchEvent(ev);
      });
    }
  });
}
 
Object.setPrototypeOf(Window, EventTarget.interface);
Object.setPrototypeOf(Window.prototype, EventTarget.interface.prototype);
 
function matchesDontThrow(el, selector) {
  try {
    return el.matches(selector);
  } catch (e) {
    return false;
  }
}
 
function startTimer(window, startFn, stopFn, timerId, callback, ms, args) {
  if (typeof callback !== "function") {
    const code = String(callback);
    callback = window._globalProxy.eval.bind(window, code + `\n//# sourceURL=${window.location.href}`);
  }
 
  const oldCallback = callback;
  callback = () => {
    try {
      oldCallback.apply(window._globalProxy, args);
    } catch (e) {
      reportException(window, e, window.location.href);
    }
  };
 
  const res = startFn(callback, ms);
  window.__timers[timerId] = [res, stopFn];
  return timerId;
}
 
function stopTimer(window, id) {
  const timer = window.__timers[id];
  if (timer) {
    // Need to .call() with undefined to ensure the thisArg is not timer itself
    timer[1].call(undefined, timer[0]);
    delete window.__timers[id];
  }
}
 
function stopAllTimers(window) {
  Object.keys(window.__timers).forEach(key => {
    const timer = window.__timers[key];
    // Need to .call() with undefined to ensure the thisArg is not timer itself
    timer[1].call(undefined, timer[0]);
  });
  window.__timers = Object.create(null);
}
 
 

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// Ideally, we would use
// https://html.spec.whatwg.org/multipage/rendering.html#the-css-user-agent-style-sheet-and-presentational-hints
// but for now, just use the version from blink. This file is copied from
// https://chromium.googlesource.com/chromium/blink/+/96aa3a280ab7d67178c8f122a04949ce5f8579e0/Source/core/css/html.css
// (removed a line which had octal literals inside since octal literals are not allowed in template strings)
 
// We use a .js file because otherwise we can't browserify this. (brfs is unusable due to lack of ES2015 support)
 
module.exports = `
/*
 * The default style sheet used to render HTML.
 *
 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */
 
@namespace "http://www.w3.org/1999/xhtml";
 
html {
    display: block
}
 
:root {
    scroll-blocks-on: start-touch wheel-event
}
 
/* children of the <head> element all have display:none */
head {
    display: none
}
 
meta {
    display: none
}
 
title {
    display: none
}
 
link {
    display: none
}
 
style {
    display: none
}
 
script {
    display: none
}
 
/* generic block-level elements */
 
body {
    display: block;
    margin: 8px
}
 
body:-webkit-full-page-media {
    background-color: rgb(0, 0, 0)
}
 
p {
    display: block;
    -webkit-margin-before: 1__qem;
    -webkit-margin-after: 1__qem;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
}
 
div {
    display: block
}
 
layer {
    display: block
}
 
article, aside, footer, header, hgroup, main, nav, section {
    display: block
}
 
marquee {
    display: inline-block;
}
 
address {
    display: block
}
 
blockquote {
    display: block;
    -webkit-margin-before: 1__qem;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 40px;
    -webkit-margin-end: 40px;
}
 
figcaption {
    display: block
}
 
figure {
    display: block;
    -webkit-margin-before: 1em;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 40px;
    -webkit-margin-end: 40px;
}
 
q {
    display: inline
}
 
q:before {
    content: open-quote;
}
 
q:after {
    content: close-quote;
}
 
center {
    display: block;
    /* special centering to be able to emulate the html4/netscape behaviour */
    text-align: -webkit-center
}
 
hr {
    display: block;
    -webkit-margin-before: 0.5em;
    -webkit-margin-after: 0.5em;
    -webkit-margin-start: auto;
    -webkit-margin-end: auto;
    border-style: inset;
    border-width: 1px;
    box-sizing: border-box
}
 
map {
    display: inline
}
 
video {
    object-fit: contain;
}
 
/* heading elements */
 
h1 {
    display: block;
    font-size: 2em;
    -webkit-margin-before: 0.67__qem;
    -webkit-margin-after: 0.67em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    font-weight: bold
}
 
:-webkit-any(article,aside,nav,section) h1 {
    font-size: 1.5em;
    -webkit-margin-before: 0.83__qem;
    -webkit-margin-after: 0.83em;
}
 
:-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) h1 {
    font-size: 1.17em;
    -webkit-margin-before: 1__qem;
    -webkit-margin-after: 1em;
}
 
:-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) h1 {
    font-size: 1.00em;
    -webkit-margin-before: 1.33__qem;
    -webkit-margin-after: 1.33em;
}
 
:-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) h1 {
    font-size: .83em;
    -webkit-margin-before: 1.67__qem;
    -webkit-margin-after: 1.67em;
}
 
:-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) :-webkit-any(article,aside,nav,section) h1 {
    font-size: .67em;
    -webkit-margin-before: 2.33__qem;
    -webkit-margin-after: 2.33em;
}
 
h2 {
    display: block;
    font-size: 1.5em;
    -webkit-margin-before: 0.83__qem;
    -webkit-margin-after: 0.83em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    font-weight: bold
}
 
h3 {
    display: block;
    font-size: 1.17em;
    -webkit-margin-before: 1__qem;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    font-weight: bold
}
 
h4 {
    display: block;
    -webkit-margin-before: 1.33__qem;
    -webkit-margin-after: 1.33em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    font-weight: bold
}
 
h5 {
    display: block;
    font-size: .83em;
    -webkit-margin-before: 1.67__qem;
    -webkit-margin-after: 1.67em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    font-weight: bold
}
 
h6 {
    display: block;
    font-size: .67em;
    -webkit-margin-before: 2.33__qem;
    -webkit-margin-after: 2.33em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    font-weight: bold
}
 
/* tables */
 
table {
    display: table;
    border-collapse: separate;
    border-spacing: 2px;
    border-color: gray
}
 
thead {
    display: table-header-group;
    vertical-align: middle;
    border-color: inherit
}
 
tbody {
    display: table-row-group;
    vertical-align: middle;
    border-color: inherit
}
 
tfoot {
    display: table-footer-group;
    vertical-align: middle;
    border-color: inherit
}
 
/* for tables without table section elements (can happen with XHTML or dynamically created tables) */
table > tr {
    vertical-align: middle;
}
 
col {
    display: table-column
}
 
colgroup {
    display: table-column-group
}
 
tr {
    display: table-row;
    vertical-align: inherit;
    border-color: inherit
}
 
td, th {
    display: table-cell;
    vertical-align: inherit
}
 
th {
    font-weight: bold
}
 
caption {
    display: table-caption;
    text-align: -webkit-center
}
 
/* lists */
 
ul, menu, dir {
    display: block;
    list-style-type: disc;
    -webkit-margin-before: 1__qem;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    -webkit-padding-start: 40px
}
 
ol {
    display: block;
    list-style-type: decimal;
    -webkit-margin-before: 1__qem;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
    -webkit-padding-start: 40px
}
 
li {
    display: list-item;
    text-align: -webkit-match-parent;
}
 
ul ul, ol ul {
    list-style-type: circle
}
 
ol ol ul, ol ul ul, ul ol ul, ul ul ul {
    list-style-type: square
}
 
dd {
    display: block;
    -webkit-margin-start: 40px
}
 
dl {
    display: block;
    -webkit-margin-before: 1__qem;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 0;
    -webkit-margin-end: 0;
}
 
dt {
    display: block
}
 
ol ul, ul ol, ul ul, ol ol {
    -webkit-margin-before: 0;
    -webkit-margin-after: 0
}
 
/* form elements */
 
form {
    display: block;
    margin-top: 0__qem;
}
 
label {
    cursor: default;
}
 
legend {
    display: block;
    -webkit-padding-start: 2px;
    -webkit-padding-end: 2px;
    border: none
}
 
fieldset {
    display: block;
    -webkit-margin-start: 2px;
    -webkit-margin-end: 2px;
    -webkit-padding-before: 0.35em;
    -webkit-padding-start: 0.75em;
    -webkit-padding-end: 0.75em;
    -webkit-padding-after: 0.625em;
    border: 2px groove ThreeDFace;
    min-width: -webkit-min-content;
}
 
button {
    -webkit-appearance: button;
}
 
/* Form controls don't go vertical. */
input, textarea, keygen, select, button, meter, progress {
    -webkit-writing-mode: horizontal-tb !important;
}
 
input, textarea, keygen, select, button {
    margin: 0__qem;
    font: -webkit-small-control;
    text-rendering: auto; /* FIXME: Remove when tabs work with optimizeLegibility. */
    color: initial;
    letter-spacing: normal;
    word-spacing: normal;
    line-height: normal;
    text-transform: none;
    text-indent: 0;
    text-shadow: none;
    display: inline-block;
    text-align: start;
}
 
input[type="hidden" i] {
    display: none
}
 
input {
    -webkit-appearance: textfield;
    padding: 1px;
    background-color: white;
    border: 2px inset;
    -webkit-rtl-ordering: logical;
    -webkit-user-select: text;
    cursor: auto;
}
 
input[type="search" i] {
    -webkit-appearance: searchfield;
    box-sizing: border-box;
}
 
input::-webkit-textfield-decoration-container {
    display: flex;
    align-items: center;
    -webkit-user-modify: read-only !important;
    content: none !important;
}
 
input[type="search" i]::-webkit-textfield-decoration-container {
    direction: ltr;
}
 
input::-webkit-clear-button {
    -webkit-appearance: searchfield-cancel-button;
    display: inline-block;
    flex: none;
    -webkit-user-modify: read-only !important;
    -webkit-margin-start: 2px;
    opacity: 0;
    pointer-events: none;
}
 
input:enabled:read-write:-webkit-any(:focus,:hover)::-webkit-clear-button {
    opacity: 1;
    pointer-events: auto;
}
 
input[type="search" i]::-webkit-search-cancel-button {
    -webkit-appearance: searchfield-cancel-button;
    display: block;
    flex: none;
    -webkit-user-modify: read-only !important;
    -webkit-margin-start: 1px;
    opacity: 0;
    pointer-events: none;
}
 
input[type="search" i]:enabled:read-write:-webkit-any(:focus,:hover)::-webkit-search-cancel-button {
    opacity: 1;
    pointer-events: auto;
}
 
input[type="search" i]::-webkit-search-decoration {
    -webkit-appearance: searchfield-decoration;
    display: block;
    flex: none;
    -webkit-user-modify: read-only !important;
    -webkit-align-self: flex-start;
    margin: auto 0;
}
 
input[type="search" i]::-webkit-search-results-decoration {
    -webkit-appearance: searchfield-results-decoration;
    display: block;
    flex: none;
    -webkit-user-modify: read-only !important;
    -webkit-align-self: flex-start;
    margin: auto 0;
}
 
input::-webkit-inner-spin-button {
    -webkit-appearance: inner-spin-button;
    display: inline-block;
    cursor: default;
    flex: none;
    align-self: stretch;
    -webkit-user-select: none;
    -webkit-user-modify: read-only !important;
    opacity: 0;
    pointer-events: none;
}
 
input:enabled:read-write:-webkit-any(:focus,:hover)::-webkit-inner-spin-button {
    opacity: 1;
    pointer-events: auto;
}
 
keygen, select {
    border-radius: 5px;
}
 
keygen::-webkit-keygen-select {
    margin: 0px;
}
 
textarea {
    -webkit-appearance: textarea;
    background-color: white;
    border: 1px solid;
    -webkit-rtl-ordering: logical;
    -webkit-user-select: text;
    flex-direction: column;
    resize: auto;
    cursor: auto;
    padding: 2px;
    white-space: pre-wrap;
    word-wrap: break-word;
}
 
::-webkit-input-placeholder {
    -webkit-text-security: none;
    color: darkGray;
    display: block !important;
    pointer-events: none !important;
}
 
input::-webkit-input-placeholder {
    white-space: pre;
    word-wrap: normal;
    overflow: hidden;
    -webkit-user-modify: read-only !important;
}
 
input[type="password" i] {
    -webkit-text-security: disc !important;
}
 
input[type="hidden" i], input[type="image" i], input[type="file" i] {
    -webkit-appearance: initial;
    padding: initial;
    background-color: initial;
    border: initial;
}
 
input[type="file" i] {
    align-items: baseline;
    color: inherit;
    text-align: start !important;
}
 
input:-webkit-autofill, textarea:-webkit-autofill, select:-webkit-autofill {
    background-color: #FAFFBD !important;
    background-image:none !important;
    color: #000000 !important;
}
 
input[type="radio" i], input[type="checkbox" i] {
    margin: 3px 0.5ex;
    padding: initial;
    background-color: initial;
    border: initial;
}
 
input[type="button" i], input[type="submit" i], input[type="reset" i] {
    -webkit-appearance: push-button;
    -webkit-user-select: none;
    white-space: pre
}
 
input[type="file" i]::-webkit-file-upload-button {
    -webkit-appearance: push-button;
    -webkit-user-modify: read-only !important;
    white-space: nowrap;
    margin: 0;
    font-size: inherit;
}
 
input[type="button" i], input[type="submit" i], input[type="reset" i], input[type="file" i]::-webkit-file-upload-button, button {
    align-items: flex-start;
    text-align: center;
    cursor: default;
    color: ButtonText;
    padding: 2px 6px 3px 6px;
    border: 2px outset ButtonFace;
    background-color: ButtonFace;
    box-sizing: border-box
}
 
input[type="range" i] {
    -webkit-appearance: slider-horizontal;
    padding: initial;
    border: initial;
    margin: 2px;
    color: #909090;
}
 
input[type="range" i]::-webkit-slider-container, input[type="range" i]::-webkit-media-slider-container {
    flex: 1;
    min-width: 0;
    box-sizing: border-box;
    -webkit-user-modify: read-only !important;
    display: flex;
}
 
input[type="range" i]::-webkit-slider-runnable-track {
    flex: 1;
    min-width: 0;
    -webkit-align-self: center;
 
    box-sizing: border-box;
    -webkit-user-modify: read-only !important;
    display: block;
}
 
input[type="range" i]::-webkit-slider-thumb, input[type="range" i]::-webkit-media-slider-thumb {
    -webkit-appearance: sliderthumb-horizontal;
    box-sizing: border-box;
    -webkit-user-modify: read-only !important;
    display: block;
}
 
input[type="button" i]:disabled, input[type="submit" i]:disabled, input[type="reset" i]:disabled,
input[type="file" i]:disabled::-webkit-file-upload-button, button:disabled,
select:disabled, keygen:disabled, optgroup:disabled, option:disabled,
select[disabled]>option {
    color: GrayText
}
 
input[type="button" i]:active, input[type="submit" i]:active, input[type="reset" i]:active, input[type="file" i]:active::-webkit-file-upload-button, button:active {
    border-style: inset
}
 
input[type="button" i]:active:disabled, input[type="submit" i]:active:disabled, input[type="reset" i]:active:disabled, input[type="file" i]:active:disabled::-webkit-file-upload-button, button:active:disabled {
    border-style: outset
}
 
option:-internal-spatial-navigation-focus {
    outline: black dashed 1px;
    outline-offset: -1px;
}
 
datalist {
    display: none
}
 
area {
    display: inline;
    cursor: pointer;
}
 
param {
    display: none
}
 
input[type="checkbox" i] {
    -webkit-appearance: checkbox;
    box-sizing: border-box;
}
 
input[type="radio" i] {
    -webkit-appearance: radio;
    box-sizing: border-box;
}
 
input[type="color" i] {
    -webkit-appearance: square-button;
    width: 44px;
    height: 23px;
    background-color: ButtonFace;
    /* Same as native_theme_base. */
    border: 1px #a9a9a9 solid;
    padding: 1px 2px;
}
 
input[type="color" i]::-webkit-color-swatch-wrapper {
    display:flex;
    padding: 4px 2px;
    box-sizing: border-box;
    -webkit-user-modify: read-only !important;
    width: 100%;
    height: 100%
}
 
input[type="color" i]::-webkit-color-swatch {
    background-color: #000000;
    border: 1px solid #777777;
    flex: 1;
    min-width: 0;
    -webkit-user-modify: read-only !important;
}
 
input[type="color" i][list] {
    -webkit-appearance: menulist;
    width: 88px;
    height: 23px
}
 
input[type="color" i][list]::-webkit-color-swatch-wrapper {
    padding-left: 8px;
    padding-right: 24px;
}
 
input[type="color" i][list]::-webkit-color-swatch {
    border-color: #000000;
}
 
input::-webkit-calendar-picker-indicator {
    display: inline-block;
    width: 0.66em;
    height: 0.66em;
    padding: 0.17em 0.34em;
    -webkit-user-modify: read-only !important;
    opacity: 0;
    pointer-events: none;
}
 
input::-webkit-calendar-picker-indicator:hover {
    background-color: #eee;
}
 
input:enabled:read-write:-webkit-any(:focus,:hover)::-webkit-calendar-picker-indicator,
input::-webkit-calendar-picker-indicator:focus {
    opacity: 1;
    pointer-events: auto;
}
 
input[type="date" i]:disabled::-webkit-clear-button,
input[type="date" i]:disabled::-webkit-inner-spin-button,
input[type="datetime-local" i]:disabled::-webkit-clear-button,
input[type="datetime-local" i]:disabled::-webkit-inner-spin-button,
input[type="month" i]:disabled::-webkit-clear-button,
input[type="month" i]:disabled::-webkit-inner-spin-button,
input[type="week" i]:disabled::-webkit-clear-button,
input[type="week" i]:disabled::-webkit-inner-spin-button,
input:disabled::-webkit-calendar-picker-indicator,
input[type="date" i][readonly]::-webkit-clear-button,
input[type="date" i][readonly]::-webkit-inner-spin-button,
input[type="datetime-local" i][readonly]::-webkit-clear-button,
input[type="datetime-local" i][readonly]::-webkit-inner-spin-button,
input[type="month" i][readonly]::-webkit-clear-button,
input[type="month" i][readonly]::-webkit-inner-spin-button,
input[type="week" i][readonly]::-webkit-clear-button,
input[type="week" i][readonly]::-webkit-inner-spin-button,
input[readonly]::-webkit-calendar-picker-indicator {
    visibility: hidden;
}
 
select {
    -webkit-appearance: menulist;
    box-sizing: border-box;
    align-items: center;
    border: 1px solid;
    white-space: pre;
    -webkit-rtl-ordering: logical;
    color: black;
    background-color: white;
    cursor: default;
}
 
select:not(:-internal-list-box) {
    overflow: visible !important;
}
 
select:-internal-list-box {
    -webkit-appearance: listbox;
    align-items: flex-start;
    border: 1px inset gray;
    border-radius: initial;
    overflow-x: hidden;
    overflow-y: scroll;
    vertical-align: text-bottom;
    -webkit-user-select: none;
    white-space: nowrap;
}
 
optgroup {
    font-weight: bolder;
    display: block;
}
 
option {
    font-weight: normal;
    display: block;
    padding: 0 2px 1px 2px;
    white-space: pre;
    min-height: 1.2em;
}
 
select:-internal-list-box option,
select:-internal-list-box optgroup {
    line-height: initial !important;
}
 
select:-internal-list-box:focus option:checked {
    background-color: -internal-active-list-box-selection !important;
    color: -internal-active-list-box-selection-text !important;
}
 
select:-internal-list-box option:checked {
    background-color: -internal-inactive-list-box-selection !important;
    color: -internal-inactive-list-box-selection-text !important;
}
 
select:-internal-list-box:disabled option:checked,
select:-internal-list-box option:checked:disabled {
    color: gray !important;
}
 
select:-internal-list-box hr {
    border-style: none;
}
 
output {
    display: inline;
}
 
/* meter */
 
meter {
    -webkit-appearance: meter;
    box-sizing: border-box;
    display: inline-block;
    height: 1em;
    width: 5em;
    vertical-align: -0.2em;
}
 
meter::-webkit-meter-inner-element {
    -webkit-appearance: inherit;
    box-sizing: inherit;
    -webkit-user-modify: read-only !important;
    height: 100%;
    width: 100%;
}
 
meter::-webkit-meter-bar {
    background: linear-gradient(to bottom, #ddd, #eee 20%, #ccc 45%, #ccc 55%, #ddd);
    height: 100%;
    width: 100%;
    -webkit-user-modify: read-only !important;
    box-sizing: border-box;
}
 
meter::-webkit-meter-optimum-value {
    background: linear-gradient(to bottom, #ad7, #cea 20%, #7a3 45%, #7a3 55%, #ad7);
    height: 100%;
    -webkit-user-modify: read-only !important;
    box-sizing: border-box;
}
 
meter::-webkit-meter-suboptimum-value {
    background: linear-gradient(to bottom, #fe7, #ffc 20%, #db3 45%, #db3 55%, #fe7);
    height: 100%;
    -webkit-user-modify: read-only !important;
    box-sizing: border-box;
}
 
meter::-webkit-meter-even-less-good-value {
    background: linear-gradient(to bottom, #f77, #fcc 20%, #d44 45%, #d44 55%, #f77);
    height: 100%;
    -webkit-user-modify: read-only !important;
    box-sizing: border-box;
}
 
/* progress */
 
progress {
    -webkit-appearance: progress-bar;
    box-sizing: border-box;
    display: inline-block;
    height: 1em;
    width: 10em;
    vertical-align: -0.2em;
}
 
progress::-webkit-progress-inner-element {
    -webkit-appearance: inherit;
    box-sizing: inherit;
    -webkit-user-modify: read-only;
    height: 100%;
    width: 100%;
}
 
progress::-webkit-progress-bar {
    background-color: gray;
    height: 100%;
    width: 100%;
    -webkit-user-modify: read-only !important;
    box-sizing: border-box;
}
 
progress::-webkit-progress-value {
    background-color: green;
    height: 100%;
    width: 50%; /* should be removed later */
    -webkit-user-modify: read-only !important;
    box-sizing: border-box;
}
 
/* inline elements */
 
u, ins {
    text-decoration: underline
}
 
strong, b {
    font-weight: bold
}
 
i, cite, em, var, address, dfn {
    font-style: italic
}
 
tt, code, kbd, samp {
    font-family: monospace
}
 
pre, xmp, plaintext, listing {
    display: block;
    font-family: monospace;
    white-space: pre;
    margin: 1__qem 0
}
 
mark {
    background-color: yellow;
    color: black
}
 
big {
    font-size: larger
}
 
small {
    font-size: smaller
}
 
s, strike, del {
    text-decoration: line-through
}
 
sub {
    vertical-align: sub;
    font-size: smaller
}
 
sup {
    vertical-align: super;
    font-size: smaller
}
 
nobr {
    white-space: nowrap
}
 
/* states */
 
:focus {
    outline: auto 5px -webkit-focus-ring-color
}
 
/* Read-only text fields do not show a focus ring but do still receive focus */
html:focus, body:focus, input[readonly]:focus {
    outline: none
}
 
applet:focus, embed:focus, iframe:focus, object:focus {
    outline: none
}
 
input:focus, textarea:focus, keygen:focus, select:focus {
    outline-offset: -2px
}
 
input[type="button" i]:focus,
input[type="checkbox" i]:focus,
input[type="file" i]:focus,
input[type="hidden" i]:focus,
input[type="image" i]:focus,
input[type="radio" i]:focus,
input[type="reset" i]:focus,
input[type="search" i]:focus,
input[type="submit" i]:focus,
input[type="file" i]:focus::-webkit-file-upload-button {
    outline-offset: 0
}
 
a:-webkit-any-link {
    color: -webkit-link;
    text-decoration: underline;
    cursor: auto;
}
 
a:-webkit-any-link:active {
    color: -webkit-activelink
}
 
/* HTML5 ruby elements */
 
ruby, rt {
    text-indent: 0; /* blocks used for ruby rendering should not trigger this */
}
 
rt {
    line-height: normal;
    -webkit-text-emphasis: none;
}
 
ruby > rt {
    display: block;
    font-size: 50%;
    text-align: start;
}
 
ruby > rp {
    display: none;
}
 
/* other elements */
 
noframes {
    display: none
}
 
frameset, frame {
    display: block
}
 
frameset {
    border-color: inherit
}
 
iframe {
    border: 2px inset
}
 
details {
    display: block
}
 
summary {
    display: block
}
 
summary::-webkit-details-marker {
    display: inline-block;
    width: 0.66em;
    height: 0.66em;
    -webkit-margin-end: 0.4em;
}
 
template {
    display: none
}
 
bdi, output {
    unicode-bidi: -webkit-isolate;
}
 
bdo {
    unicode-bidi: bidi-override;
}
 
textarea[dir=auto i] {
    unicode-bidi: -webkit-plaintext;
}
 
dialog:not([open]) {
    display: none
}
 
dialog {
    position: absolute;
    left: 0;
    right: 0;
    width: -webkit-fit-content;
    height: -webkit-fit-content;
    margin: auto;
    border: solid;
    padding: 1em;
    background: white;
    color: black
}
 
dialog::backdrop {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(0,0,0,0.1)
}
 
/* page */
 
@page {
    /* FIXME: Define the right default values for page properties. */
    size: auto;
    margin: auto;
    padding: 0px;
    border-width: 0px;
}
 
/* noscript is handled internally, as it depends on settings. */
 
`;
 
 

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"use strict";
 
const idlUtils = require("../living/generated/utils");
 
// Tree traversing
exports.getFirstChild = function (node) {
  return node.childNodes[0];
};
 
exports.getChildNodes = function (node) {
  // parse5 treats template elements specially, assuming you return an array whose single item is the document fragment
  const children = node._templateContents ? [node._templateContents] : [];
  if (children.length === 0) {
    for (let i = 0; i < node.childNodes.length; ++i) {
      children.push(idlUtils.implForWrapper(node.childNodes[i]));
    }
  }
  return children;
};
 
exports.getParentNode = function (node) {
  return node.parentNode;
};
 
exports.getAttrList = function (node) {
  return node.attributes;
};
 
// Node data
exports.getTagName = function (element) {
  return element.tagName.toLowerCase();
};
 
exports.getNamespaceURI = function (element) {
  return element.namespaceURI || "http://www.w3.org/1999/xhtml";
};
 
exports.getTextNodeContent = function (textNode) {
  return textNode.nodeValue;
};
 
exports.getCommentNodeContent = function (commentNode) {
  return commentNode.nodeValue;
};
 
exports.getDocumentTypeNodeName = function (doctypeNode) {
  return doctypeNode.name;
};
 
exports.getDocumentTypeNodePublicId = function (doctypeNode) {
  return doctypeNode.publicId || null;
};
 
exports.getDocumentTypeNodeSystemId = function (doctypeNode) {
  return doctypeNode.systemId || null;
};
 
// Node types
exports.isTextNode = function (node) {
  return node.nodeName === "#text";
};
 
exports.isCommentNode = function (node) {
  return node.nodeName === "#comment";
};
 
exports.isDocumentTypeNode = function (node) {
  return node.nodeType === 10;
};
 
exports.isElementNode = function (node) {
  return Boolean(node.tagName);
};
 
 

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exports.availableDocumentFeatures = [
  "FetchExternalResources",
  "ProcessExternalResources",
  "SkipExternalResources"
];
 
exports.defaultDocumentFeatures = {
  FetchExternalResources: ["script", "link"], // omitted by default: "frame"
  ProcessExternalResources: ["script"], // omitted by default: "frame", "iframe"
  SkipExternalResources: false
};
 
exports.applyDocumentFeatures = (documentImpl, features) => {
  features = features || {};
 
  for (let i = 0; i < exports.availableDocumentFeatures.length; ++i) {
    const featureName = exports.availableDocumentFeatures[i];
    let featureSource;
 
    if (features[featureName] !== undefined) {
      featureSource = features[featureName];
      // We have to check the lowercase version also because the Document feature
      // methods convert everything to lowercase.
    } else if (typeof features[featureName.toLowerCase()] !== "undefined") {
      featureSource = features[featureName.toLowerCase()];
    } else if (exports.defaultDocumentFeatures[featureName]) {
      featureSource = exports.defaultDocumentFeatures[featureName];
    } else {
      continue;
    }
 
    const implImpl = documentImpl._implementation;
    implImpl._removeFeature(featureName);
 
    if (featureSource !== undefined) {
      if (Array.isArray(featureSource)) {
        for (let j = 0; j < featureSource.length; ++j) {
          implImpl._addFeature(featureName, featureSource[j]);
        }
      } else {
        implImpl._addFeature(featureName, featureSource);
      }
    }
  }
};
 
 

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"use strict";
const parse5 = require("parse5");
const documentAdapter = require("./documentAdapter");
const NODE_TYPE = require("../living/node-type");
const idlUtils = require("../living/generated/utils");
 
const serializer = new parse5.TreeSerializer(documentAdapter);
 
exports.domToHtml = function (iterable) {
  let ret = "";
  for (const node of iterable) {
    if (node.nodeType === NODE_TYPE.DOCUMENT_NODE) {
      ret += serializer.serialize(node);
    } else {
      ret += serializer.serialize({ childNodes: [idlUtils.wrapperForImpl(node)] });
    }
  }
  return ret;
};
 
 

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"use strict";
 
const parse5 = require("parse5");
const sax = require("sax");
const attributes = require("../living/attributes");
const DocumentType = require("../living/generated/DocumentType");
const locationInfo = require("../living/helpers/internal-constants").locationInfo;
 
class HtmlToDom {
  constructor(core, parser, parsingMode) {
    if (!parser) {
      if (parsingMode === "xml") {
        parser = sax;
      } else {
        parser = parse5;
      }
    }
 
    this.core = core;
    this.parser = parser;
    this.parsingMode = parsingMode;
 
    if (parser.DefaultHandler) {
      this.parserType = "htmlparser2";
    } else if (parser.Parser && parser.TreeAdapters) {
      this.parserType = "parse5v1";
    } else if (parser.moduleName === "HTML5") {
      this.parserType = "html5";
    } else if (parser.parser) {
      this.parserType = "sax";
    }
  }
 
  appendHtmlToElement(html, element) {
    if (typeof html !== "string") {
      html = String(html);
    }
 
    return this["_parseWith" + this.parserType](html, true, element);
  }
 
  appendHtmlToDocument(html, element) {
    if (typeof html !== "string") {
      html = String(html);
    }
 
    return this["_parseWith" + this.parserType](html, false, element);
  }
 
  _parseWithhtmlparser2(html, fragment, element) {
    const handler = new this.parser.DefaultHandler();
    // Check if document is XML
    const isXML = this.parsingMode === "xml";
    const parserInstance = new this.parser.Parser(handler, {
      xmlMode: isXML,
      lowerCaseTags: !isXML,
      lowerCaseAttributeNames: !isXML,
      decodeEntities: true
    });
 
    parserInstance.includeLocation = false;
    parserInstance.parseComplete(html);
 
    const parsed = handler.dom;
    for (let i = 0; i < parsed.length; i++) {
      setChild(this.core, element, parsed[i]);
    }
 
    return element;
  }
 
  _parseWithparse5v1(html, fragment, element) {
    if (this.parsingMode === "xml") {
      throw new Error("Can't parse XML with parse5, please use htmlparser2 instead.");
    }
 
    const htmlparser2Adapter = this.parser.TreeAdapters.htmlparser2;
    let dom;
    if (fragment) {
      const instance = new this.parser.Parser(htmlparser2Adapter);
      const parentElement = htmlparser2Adapter.createElement(element.tagName.toLowerCase(), element.namespaceURI, []);
      dom = instance.parseFragment(html, parentElement);
    } else {
      const instance = new this.parser.Parser(htmlparser2Adapter, { locationInfo: true });
      dom = instance.parse(html);
    }
 
    const parsed = dom.children;
    for (let i = 0; i < parsed.length; i++) {
      setChild(this.core, element, parsed[i]);
    }
 
    return element;
  }
 
  _parseWithhtml5(html, fragment, element) {
    if (element.nodeType === 9) {
      new this.parser.Parser({ document: element }).parse(html);
    } else {
      const p = new this.parser.Parser({ document: element.ownerDocument });
      p.parse_fragment(html, element);
    }
  }
 
  _parseWithsax(html, fragment, element) {
    const SaxParser = this.parser.parser;
    const parser = new SaxParser(/* strict = */true, { xmlns: true });
    parser.noscript = false;
    parser.looseCase = "toString";
    const openStack = [element];
    parser.ontext = text => {
      setChild(this.core, openStack[openStack.length - 1], {
        type: "text",
        data: text
      });
    };
    parser.onopentag = arg => {
      const attrValues = {};
      const attrPrefixes = {};
      const attrNamespaces = {};
      Object.keys(arg.attributes).forEach(key => {
        const localName = arg.attributes[key].local;
        attrValues[localName] = arg.attributes[key].value;
        attrPrefixes[localName] = arg.attributes[key].prefix || null;
        attrNamespaces[localName] = arg.attributes[key].uri || null;
      });
 
      if (arg.local === "script" && arg.uri === "http://www.w3.org/1999/xhtml") {
        openStack.push({
          type: "tag",
          name: arg.local,
          prefix: arg.prefix,
          namespace: arg.uri,
          attribs: attrValues,
          "x-attribsPrefix": attrPrefixes,
          "x-attribsNamespace": attrNamespaces
        });
      } else {
        const elem = setChild(this.core, openStack[openStack.length - 1], {
          type: "tag",
          name: arg.local,
          prefix: arg.prefix,
          namespace: arg.uri,
          attribs: attrValues,
          "x-attribsPrefix": attrPrefixes,
          "x-attribsNamespace": attrNamespaces
        });
        openStack.push(elem);
      }
    };
    parser.onclosetag = () => {
      const elem = openStack.pop();
      if (elem.constructor.name === "Object") { // we have an empty script tag
        setChild(this.core, openStack[openStack.length - 1], elem);
      }
    };
    parser.onscript = scriptText => {
      const tag = openStack.pop();
      tag.children = [{ type: "text", data: scriptText }];
      const elem = setChild(this.core, openStack[openStack.length - 1], tag);
      openStack.push(elem);
    };
    parser.oncomment = comment => {
      setChild(this.core, openStack[openStack.length - 1], {
        type: "comment",
        data: comment
      });
    };
    parser.onprocessinginstruction = pi => {
      setChild(this.core, openStack[openStack.length - 1], {
        type: "directive",
        name: "?" + pi.name,
        data: "?" + pi.name + " " + pi.body + "?"
      });
    };
    parser.ondoctype = dt => {
      setChild(this.core, openStack[openStack.length - 1], {
        type: "directive",
        name: "!doctype",
        data: "!doctype " + dt
      });
 
      const entityMatcher = /<!ENTITY ([^ ]+) "([^"]+)">/g;
      let result;
      while ((result = entityMatcher.exec(dt))) {
        // TODO Node v6 const [, name, value] = result;
        const name = result[1];
        const value = result[2];
        if (!(name in parser.ENTITIES)) {
          parser.ENTITIES[name] = value;
        }
      }
    };
 
    parser.onerror = err => {
      throw err;
    };
    parser.write(html).close();
  }
}
 
// utility function for forgiving parser
function setChild(core, parentImpl, node) {
  const currentDocument = parentImpl && parentImpl._ownerDocument || parentImpl;
 
  let newNode;
  let isTemplateContents = false;
  switch (node.type) {
    case "tag":
    case "script":
    case "style":
      newNode = currentDocument._createElementWithCorrectElementInterface(node.name, node.namespace);
      newNode._prefix = node.prefix || null;
      newNode._namespaceURI = node.namespace || null;
      break;
 
    case "root":
      // If we are in <template> then add all children to the parent's _templateContents; skip this virtual root node.
      if (parentImpl.tagName === "TEMPLATE" && parentImpl._namespaceURI === "http://www.w3.org/1999/xhtml") {
        newNode = parentImpl._templateContents;
        isTemplateContents = true;
      }
      break;
 
    case "text":
      // HTML entities should already be decoded by the parser, so no need to decode them
      newNode = currentDocument.createTextNode(node.data);
      break;
 
    case "comment":
      newNode = currentDocument.createComment(node.data);
      break;
 
    case "directive":
      if (node.name[0] === "?" && node.name.toLowerCase() !== "?xml") {
        const data = node.data.slice(node.name.length + 1, -1);
        newNode = currentDocument.createProcessingInstruction(node.name.substring(1), data);
      } else if (node.name.toLowerCase() === "!doctype") {
        if (node["x-name"] !== undefined) { // parse5 supports doctypes directly
          newNode = createDocumentTypeInternal(core, currentDocument,
            node["x-name"] || "",
            node["x-publicId"] || "",
            node["x-systemId"] || "");
        } else {
          newNode = parseDocType(core, currentDocument, "<" + node.data + ">");
        }
      }
      break;
  }
 
  if (!newNode) {
    return null;
  }
 
  newNode[locationInfo] = node.__location;
 
  if (node.attribs) {
    Object.keys(node.attribs).forEach(localName => {
      const value = node.attribs[localName];
      let prefix =
        node["x-attribsPrefix"] &&
        Object.prototype.hasOwnProperty.call(node["x-attribsPrefix"], localName) &&
        node["x-attribsPrefix"][localName] || null;
      const namespace =
        node["x-attribsNamespace"] &&
        Object.prototype.hasOwnProperty.call(node["x-attribsNamespace"], localName) &&
        node["x-attribsNamespace"][localName] || null;
      if (prefix === "xmlns" && localName === "") {
         // intended weirdness in node-sax, see https://github.com/isaacs/sax-js/issues/165
        localName = prefix;
        prefix = null;
      }
      attributes.setAttributeValue(newNode, localName, value, prefix, namespace);
    });
  }
 
  if (node.children) {
    for (let c = 0; c < node.children.length; c++) {
      setChild(core, newNode, node.children[c]);
    }
  }
 
  if (!isTemplateContents) {
    if (parentImpl._templateContents) {
      // Setting innerHTML on a <template>
      parentImpl._templateContents.appendChild(newNode);
    } else {
      parentImpl.appendChild(newNode);
    }
  }
 
  return newNode;
}
 
const HTML5_DOCTYPE = /<!doctype html>/i;
const PUBLIC_DOCTYPE = /<!doctype\s+([^\s]+)\s+public\s+"([^"]+)"\s+"([^"]+)"/i;
const SYSTEM_DOCTYPE = /<!doctype\s+([^\s]+)\s+system\s+"([^"]+)"/i;
 
function parseDocType(core, doc, html) {
  if (HTML5_DOCTYPE.test(html)) {
    return createDocumentTypeInternal(core, doc, "html", "", "");
  }
 
  const publicPieces = PUBLIC_DOCTYPE.exec(html);
  if (publicPieces) {
    return createDocumentTypeInternal(core, doc, publicPieces[1], publicPieces[2], publicPieces[3]);
  }
 
  const systemPieces = SYSTEM_DOCTYPE.exec(html);
  if (systemPieces) {
    return createDocumentTypeInternal(core, doc, systemPieces[1], "", systemPieces[2]);
  }
 
  // Shouldn't get here (the parser shouldn't let us know about invalid doctypes), but our logic likely isn't
  // real-world perfect, so let's fallback.
  return createDocumentTypeInternal(core, doc, "html", "", "");
}
 
function createDocumentTypeInternal(core, ownerDocument, name, publicId, systemId) {
  return DocumentType.createImpl([], { core, ownerDocument, name, publicId, systemId });
}
 
exports.HtmlToDom = HtmlToDom;
 
 

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"use strict";
 
module.exports = function (nameForErrorMessage, window) {
  if (!window) {
    // Do nothing for window-less documents.
    return;
  }
 
  const error = new Error(`Not implemented: ${nameForErrorMessage}`);
  error.type = "not implemented";
 
  window._virtualConsole.emit("jsdomError", error);
};
 
 

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"use strict";
 
const parseContentType = require("content-type-parser");
const sniffHTMLEncoding = require("html-encoding-sniffer");
const whatwgEncoding = require("whatwg-encoding");
const parseDataUrl = require("../utils").parseDataUrl;
const fs = require("fs");
const request = require("request");
const documentBaseURLSerialized = require("../living/helpers/document-base-url").documentBaseURLSerialized;
const NODE_TYPE = require("../living/node-type");
 
/* eslint-disable no-restricted-modules */
// TODO: stop using the built-in URL in favor of the spec-compliant whatwg-url package
// This legacy usage is in the process of being purged.
const URL = require("url");
/* eslint-enable no-restricted-modules */
 
const IS_BROWSER = Object.prototype.toString.call(process) !== "[object process]";
 
function createResourceLoadHandler(element, resourceUrl, document, loadCallback) {
  if (loadCallback === undefined) {
    loadCallback = () => {
      // do nothing
    };
  }
  return (err, data, response) => {
    const ev = document.createEvent("HTMLEvents");
 
    if (!err) {
      try {
        loadCallback.call(element, data, resourceUrl, response);
        ev.initEvent("load", false, false);
      } catch (e) {
        err = e;
      }
    }
 
    if (err) {
      if (!err.isAbortError) {
        ev.initEvent("error", false, false);
        ev.error = err;
        element.dispatchEvent(ev);
 
        const error = new Error(`Could not load ${element.localName}: "${resourceUrl}"`);
        error.detail = err;
        error.type = "resource loading";
 
        document._defaultView._virtualConsole.emit("jsdomError", error);
      }
    } else {
      element.dispatchEvent(ev);
    }
  };
}
 
exports.readFile = function (filePath, options, callback) {
  const readableStream = fs.createReadStream(filePath);
 
  let data = new Buffer(0);
 
  readableStream.on("error", callback);
 
  readableStream.on("data", chunk => {
    data = Buffer.concat([data, chunk]);
  });
 
  const defaultEncoding = options.defaultEncoding;
  const detectMetaCharset = options.detectMetaCharset;
 
  readableStream.on("end", () => {
    // Not passing default encoding means binary
    if (defaultEncoding) {
      const encoding = detectMetaCharset ? sniffHTMLEncoding(data, { defaultEncoding }) :
                       whatwgEncoding.getBOMEncoding(data) || defaultEncoding;
      const decoded = whatwgEncoding.decode(data, encoding);
      callback(null, decoded, { headers: { "content-type": "text/plain;charset=" + encoding } });
    } else {
      callback(null, data);
    }
  });
 
  return {
    abort() {
      readableStream.destroy();
      const error = new Error("request canceled by user");
      error.isAbortError = true;
      callback(error);
    }
  };
};
 
function readDataUrl(dataUrl, options, callback) {
  const defaultEncoding = options.defaultEncoding;
  try {
    const data = parseDataUrl(dataUrl);
    // If default encoding does not exist, pass on binary data.
    if (defaultEncoding) {
      const contentType = parseContentType(data.type) || parseContentType("text/plain");
      const sniffOptions = {
        transportLayerEncodingLabel: contentType.get("charset"),
        defaultEncoding
      };
 
      const encoding = options.detectMetaCharset ? sniffHTMLEncoding(data.buffer, sniffOptions) :
                       whatwgEncoding.getBOMEncoding(data.buffer) ||
                       whatwgEncoding.labelToName(contentType.get("charset")) || defaultEncoding;
      const decoded = whatwgEncoding.decode(data.buffer, encoding);
 
      contentType.set("charset", encoding);
      data.type = contentType.toString();
 
      callback(null, decoded, { headers: { "content-type": data.type } });
    } else {
      callback(null, data.buffer, { headers: { "content-type": data.type } });
    }
  } catch (err) {
    callback(err, null);
  }
  return null;
}
 
// NOTE: request wraps tough-cookie cookie jar
// (see: https://github.com/request/request/blob/master/lib/cookies.js).
// Therefore, to pass our cookie jar to the request, we need to create
// request's wrapper and monkey patch it with our jar.
function wrapCookieJarForRequest(cookieJar) {
  const jarWrapper = request.jar();
  jarWrapper._jar = cookieJar;
  return jarWrapper;
}
 
function fetch(urlObj, options, callback) {
  if (urlObj.protocol === "data:") {
    return readDataUrl(urlObj.href, options, callback);
  } else if (urlObj.hostname) {
    return exports.download(urlObj, options, callback);
  }
  const filePath = urlObj.pathname
    .replace(/^file:\/\//, "")
    .replace(/^\/([a-z]):\//i, "$1:/")
    .replace(/%20/g, " ");
  return exports.readFile(filePath, options, callback);
}
 
exports.enqueue = function (element, resourceUrl, callback) {
  const document = element.nodeType === NODE_TYPE.DOCUMENT_NODE ? element : element._ownerDocument;
 
  if (document._queue) {
    const loadHandler = createResourceLoadHandler(element, resourceUrl || document.URL, document, callback);
    return document._queue.push(loadHandler);
  }
 
  return () => {
    // do nothing in queue-less documents
  };
};
 
exports.download = function (url, options, callback) {
  const requestOptions = {
    pool: options.pool,
    agent: options.agent,
    agentOptions: options.agentOptions,
    agentClass: options.agentClass,
    strictSSL: options.strictSSL,
    gzip: true,
    jar: wrapCookieJarForRequest(options.cookieJar),
    encoding: null,
    headers: {
      "User-Agent": options.userAgent,
      "Accept-Language": "en",
      Accept: options.accept || "*/*"
    }
  };
  if (options.referrer && !IS_BROWSER) {
    requestOptions.headers.referer = options.referrer;
  }
  if (options.proxy) {
    requestOptions.proxy = options.proxy;
  }
  Object.assign(requestOptions.headers, options.headers);
 
  const defaultEncoding = options.defaultEncoding;
  const detectMetaCharset = options.detectMetaCharset;
 
  const req = request(url, requestOptions, (error, response, bufferData) => {
    if (!error) {
      // If default encoding does not exist, pass on binary data.
      if (defaultEncoding) {
        const contentType = parseContentType(response.headers["content-type"]) || parseContentType("text/plain");
        const sniffOptions = {
          transportLayerEncodingLabel: contentType.get("charset"),
          defaultEncoding
        };
 
        const encoding = detectMetaCharset ? sniffHTMLEncoding(bufferData, sniffOptions) :
                        whatwgEncoding.getBOMEncoding(bufferData) ||
                        whatwgEncoding.labelToName(contentType.get("charset")) || defaultEncoding;
        const decoded = whatwgEncoding.decode(bufferData, encoding);
 
        contentType.set("charset", encoding);
        response.headers["content-type"] = contentType.toString();
 
        callback(null, decoded, response);
      } else {
        callback(null, bufferData, response);
      }
    } else {
      callback(error, null, response);
    }
  });
  return {
    abort() {
      req.abort();
      const error = new Error("request canceled by user");
      error.isAbortError = true;
      callback(error);
    }
  };
};
 
exports.load = function (element, urlString, options, callback) {
  const document = element._ownerDocument;
  const documentImpl = document.implementation;
 
  if (!documentImpl._hasFeature("FetchExternalResources", element.tagName.toLowerCase())) {
    return;
  }
 
  if (documentImpl._hasFeature("SkipExternalResources", urlString)) {
    return;
  }
 
  const urlObj = URL.parse(urlString);
  const enqueued = exports.enqueue(element, urlString, callback);
  const customLoader = document._customResourceLoader;
  const requestManager = document._requestManager;
  const cookieJar = document._cookieJar;
 
  options.accept = element._accept;
  options.cookieJar = cookieJar;
  options.referrer = document.URL;
  options.pool = document._pool;
  options.agentOptions = document._agentOptions;
  options.strictSSL = document._strictSSL;
  options.proxy = document._proxy;
  options.userAgent = document._defaultView.navigator.userAgent;
 
  let req = null;
  function wrappedEnqueued() {
    if (req && requestManager) {
      requestManager.remove(req);
    }
    // do not trigger if the window is closed
    if (element._ownerDocument && element._ownerDocument.defaultView.document) {
      enqueued.apply(this, arguments);
    }
  }
  if (typeof customLoader === "function") {
    req = customLoader({
      element,
      url: urlObj,
      cookie: cookieJar.getCookieStringSync(urlObj, { http: true }),
      baseUrl: documentBaseURLSerialized(document),
      defaultFetch(fetchCallback) {
        return fetch(urlObj, options, fetchCallback);
      }
    },
    wrappedEnqueued);
  } else {
    req = fetch(urlObj, options, wrappedEnqueued);
  }
  if (req && requestManager) {
    requestManager.add(req);
  }
};
 
 

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"use strict";
const cssom = require("cssom");
const cssstyle = require("cssstyle");
 
module.exports = core => {
 
  // What works now:
  // - Accessing the rules defined in individual stylesheets
  // - Modifications to style content attribute are reflected in style property
  // - Modifications to style property are reflected in style content attribute
  // TODO
  // - Modifications to style element's textContent are reflected in sheet property.
  // - Modifications to style element's sheet property are reflected in textContent.
  // - Modifications to link.href property are reflected in sheet property.
  // - Less-used features of link: disabled
  // - Less-used features of style: disabled, scoped, title
  // - CSSOM-View
  //   - getComputedStyle(): requires default stylesheet, cascading, inheritance,
  //     filtering by @media (screen? print?), layout for widths/heights
  // - Load events are not in the specs, but apparently some browsers
  //   implement something. Should onload only fire after all @imports have been
  //   loaded, or only the primary sheet?
 
  core.StyleSheet = cssom.StyleSheet;
  core.MediaList = cssom.MediaList;
  core.CSSStyleSheet = cssom.CSSStyleSheet;
  core.CSSRule = cssom.CSSRule;
  core.CSSStyleRule = cssom.CSSStyleRule;
  core.CSSMediaRule = cssom.CSSMediaRule;
  core.CSSImportRule = cssom.CSSImportRule;
  core.CSSStyleDeclaration = cssstyle.CSSStyleDeclaration;
 
  // Relavant specs
  // http://www.w3.org/TR/DOM-Level-2-Style (2000)
  // http://www.w3.org/TR/cssom-view/ (2008)
  // http://dev.w3.org/csswg/cssom/ (2010) Meant to replace DOM Level 2 Style
  // http://www.whatwg.org/specs/web-apps/current-work/multipage/ HTML5, of course
  // http://dev.w3.org/csswg/css-style-attr/  not sure what's new here
 
  // Objects that aren't in cssom library but should be:
  //   CSSRuleList  (cssom just uses array)
  //   CSSFontFaceRule
  //   CSSPageRule
 
  // These rules don't really make sense to implement, so CSSOM draft makes them
  // obsolete.
  //   CSSCharsetRule
  //   CSSUnknownRule
 
  // These objects are considered obsolete by CSSOM draft, although modern
  // browsers implement them.
  //   CSSValue
  //   CSSPrimitiveValue
  //   CSSValueList
  //   RGBColor
  //   Rect
  //   Counter
 
  // http://dev.w3.org/csswg/cssom/#stylesheetlist
  function StyleSheetList() {}
 
  StyleSheetList.prototype.__proto__ = Array.prototype;
 
  StyleSheetList.prototype.item = function item(i) {
    return Object.prototype.hasOwnProperty.call(this, i) ? this[i] : null;
  };
 
  core.StyleSheetList = StyleSheetList;
};
 
 

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/** Here is yet another implementation of XPath 1.0 in Javascript.
 *
 * My goal was to make it relatively compact, but as I fixed all the axis bugs
 * the axes became more and more complicated. :-(.
 *
 * I have not implemented namespaces or case-sensitive axes for XML yet.
 *
 * How to test it in Chrome: You can make a Chrome extension that replaces
 * the WebKit XPath parser with this one. But it takes a bit of effort to
 * get around isolated world and same-origin restrictions:
 * manifest.json:
    {
      "name": "XPathTest",
      "version": "0.1",
      "content_scripts": [{
        "matches": ["http://localhost/*"],  // or wildcard host
        "js": ["xpath.js", "injection.js"],
        "all_frames": true, "run_at": "document_start"
      }]
    }
 * injection.js:
    // goal: give my xpath object to the website's JS context.
    var script = document.createElement('script');
    script.textContent =
        "document.addEventListener('xpathextend', function(e) {\n" +
        "  console.log('extending document with xpath...');\n" +
        "  e.detail(window);" +
        "});";
    document.documentElement.appendChild(script);
    document.documentElement.removeChild(script);
    var evt = document.createEvent('CustomEvent');
    evt.initCustomEvent('xpathextend', true, true, this.xpath.extend);
    document.dispatchEvent(evt);
 */
module.exports = core => {
  var xpath = {};
 
  // Helper function to deal with the migration of Attr to no longer have a nodeName property despite this codebase
  // assuming it does.
  function getNodeName(nodeOrAttr) {
    return nodeOrAttr.constructor.name === 'Attr' ? nodeOrAttr.name : nodeOrAttr.nodeName;
  }
 
  /***************************************************************************
   *                            Tokenization                                 *
   ***************************************************************************/
  /**
   * The XPath lexer is basically a single regular expression, along with
   * some helper functions to pop different types.
   */
  var Stream = xpath.Stream = function Stream(str) {
    this.original = this.str = str;
    this.peeked = null;
    // TODO: not really needed, but supposedly tokenizer also disambiguates
    // a * b vs. node test *
    this.prev = null;  // for debugging
    this.prevprev = null;
  }
  Stream.prototype = {
    peek: function() {
      if (this.peeked) return this.peeked;
      var m = this.re.exec(this.str);
      if (!m) return null;
      this.str = this.str.substr(m[0].length);
      return this.peeked = m[1];
    },
    /** Peek 2 tokens ahead. */
    peek2: function() {
      this.peek();  // make sure this.peeked is set
      var m = this.re.exec(this.str);
      if (!m) return null;
      return m[1];
    },
    pop: function() {
      var r = this.peek();
      this.peeked = null;
      this.prevprev = this.prev;
      this.prev = r;
      return r;
    },
    trypop: function(tokens) {
      var tok = this.peek();
      if (tok === tokens) return this.pop();
      if (Array.isArray(tokens)) {
        for (var i = 0; i < tokens.length; ++i) {
          var t = tokens[i];
          if (t == tok) return this.pop();;
        }
      }
    },
    trypopfuncname: function() {
      var tok = this.peek();
      if (!this.isQnameRe.test(tok))
        return null;
      switch (tok) {
        case 'comment': case 'text': case 'processing-instruction': case 'node':
          return null;
      }
      if ('(' != this.peek2()) return null;
      return this.pop();
    },
    trypopaxisname: function() {
      var tok = this.peek();
      switch (tok) {
        case 'ancestor': case 'ancestor-or-self': case 'attribute':
        case 'child': case 'descendant': case 'descendant-or-self':
        case 'following': case 'following-sibling': case 'namespace':
        case 'parent': case 'preceding': case 'preceding-sibling': case 'self':
          if ('::' == this.peek2()) return this.pop();
      }
      return null;
    },
    trypopnametest: function() {
      var tok = this.peek();
      if ('*' === tok || this.startsWithNcNameRe.test(tok)) return this.pop();
      return null;
    },
    trypopliteral: function() {
      var tok = this.peek();
      if (null == tok) return null;
      var first = tok.charAt(0);
      var last = tok.charAt(tok.length - 1);
      if ('"' === first && '"' === last ||
          "'" === first && "'" === last) {
        this.pop();
        return tok.substr(1, tok.length - 2);
      }
    },
    trypopnumber: function() {
      var tok = this.peek();
      if (this.isNumberRe.test(tok)) return parseFloat(this.pop());
      else return null;
    },
    trypopvarref: function() {
      var tok = this.peek();
      if (null == tok) return null;
      if ('$' === tok.charAt(0)) return this.pop().substr(1);
      else return null;
    },
    position: function() {
      return this.original.length - this.str.length;
    }
  };
  (function() {
    // http://www.w3.org/TR/REC-xml-names/#NT-NCName
    var nameStartCharsExceptColon =
        'A-Z_a-z\xc0-\xd6\xd8-\xf6\xF8-\u02FF\u0370-\u037D\u037F-\u1FFF' +
        '\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF' +
        '\uFDF0-\uFFFD';  // JS doesn't support [#x10000-#xEFFFF]
    var nameCharExceptColon = nameStartCharsExceptColon +
        '\\-\\.0-9\xb7\u0300-\u036F\u203F-\u2040';
    var ncNameChars = '[' + nameStartCharsExceptColon +
        '][' + nameCharExceptColon + ']*'
    // http://www.w3.org/TR/REC-xml-names/#NT-QName
    var qNameChars = ncNameChars + '(?::' + ncNameChars + ')?';
    var otherChars = '\\.\\.|[\\(\\)\\[\\].@,]|::';  // .. must come before [.]
    var operatorChars =
        'and|or|mod|div|' +
        '//|!=|<=|>=|[*/|+\\-=<>]';  // //, !=, <=, >= before individual ones.
    var literal = '"[^"]*"|' + "'[^']*'";
    var numberChars = '[0-9]+(?:\\.[0-9]*)?|\\.[0-9]+';
    var variableReference = '\\$' + qNameChars;
    var nameTestChars = '\\*|' + ncNameChars + ':\\*|' + qNameChars;
    var optionalSpace = '[ \t\r\n]*';  // stricter than regexp \s.
    var nodeType = 'comment|text|processing-instruction|node';
    var re = new RegExp(
        // numberChars before otherChars so that leading-decimal doesn't become .
        '^' + optionalSpace + '(' + numberChars + '|' + otherChars + '|' +
        nameTestChars + '|' + operatorChars + '|' + literal + '|' +
        variableReference + ')'
        // operatorName | nodeType | functionName | axisName are lumped into
        // qName for now; we'll check them on pop.
    );
    Stream.prototype.re = re;
    Stream.prototype.startsWithNcNameRe = new RegExp('^' + ncNameChars);
    Stream.prototype.isQnameRe = new RegExp('^' + qNameChars + '$');
    Stream.prototype.isNumberRe = new RegExp('^' + numberChars + '$');
  })();
 
  /***************************************************************************
   *                               Parsing                                   *
   ***************************************************************************/
  var parse = xpath.parse = function parse(stream, a) {
    var r = orExpr(stream,a);
    var x, unparsed = [];
    while (x = stream.pop()) {
      unparsed.push(x);
    }
    if (unparsed.length)
      throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                               'Position ' + stream.position() +
                               ': Unparsed tokens: ' + unparsed.join(' '));
    return r;
  }
 
  /**
   * binaryL  ::= subExpr
   *            | binaryL op subExpr
   * so a op b op c becomes ((a op b) op c)
   */
  function binaryL(subExpr, stream, a, ops) {
    var lhs = subExpr(stream, a);
    if (lhs == null) return null;
    var op;
    while (op = stream.trypop(ops)) {
      var rhs = subExpr(stream, a);
      if (rhs == null)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected something after ' + op);
      lhs = a.node(op, lhs, rhs);
    }
    return lhs;
  }
  /**
   * Too bad this is never used. If they made a ** operator (raise to power),
   ( we would use it.
   * binaryR  ::= subExpr
   *            | subExpr op binaryR
   * so a op b op c becomes (a op (b op c))
   */
  function binaryR(subExpr, stream, a, ops) {
    var lhs = subExpr(stream, a);
    if (lhs == null) return null;
    var op = stream.trypop(ops);
    if (op) {
      var rhs = binaryR(stream, a);
      if (rhs == null)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected something after ' + op);
      return a.node(op, lhs, rhs);
    } else {
      return lhs;// TODO
    }
  }
  /** [1] LocationPath::= RelativeLocationPath | AbsoluteLocationPath
   * e.g. a, a/b, //a/b
   */
  function locationPath(stream, a) {
    return absoluteLocationPath(stream, a) ||
           relativeLocationPath(null, stream, a);
  }
  /** [2] AbsoluteLocationPath::= '/' RelativeLocationPath? | AbbreviatedAbsoluteLocationPath
   *  [10] AbbreviatedAbsoluteLocationPath::= '//' RelativeLocationPath
   */
  function absoluteLocationPath(stream, a) {
    var op = stream.peek();
    if ('/' === op || '//' === op) {
      var lhs = a.node('Root');
      return relativeLocationPath(lhs, stream, a, true);
    } else {
      return null;
    }
  }
  /** [3] RelativeLocationPath::= Step | RelativeLocationPath '/' Step |
   *                            | AbbreviatedRelativeLocationPath
   *  [11] AbbreviatedRelativeLocationPath::= RelativeLocationPath '//' Step
   * e.g. p/a, etc.
   */
  function relativeLocationPath(lhs, stream, a, isOnlyRootOk) {
    if (null == lhs) {
      lhs = step(stream, a);
      if (null == lhs) return lhs;
    }
    var op;
    while (op = stream.trypop(['/', '//'])) {
      if ('//' === op) {
        lhs = a.node('/', lhs,
                     a.node('Axis', 'descendant-or-self', 'node', undefined));
      }
      var rhs = step(stream, a);
      if (null == rhs && '/' === op && isOnlyRootOk) return lhs;
      else isOnlyRootOk = false;
      if (null == rhs)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected step after ' + op);
      lhs = a.node('/', lhs, rhs);
    }
    return lhs;
  }
  /** [4] Step::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep
   *  [12] AbbreviatedStep::= '.' | '..'
   * e.g. @href, self::p, p, a[@href], ., ..
   */
  function step(stream, a) {
    var abbrStep = stream.trypop(['.', '..']);
    if ('.' === abbrStep)  // A location step of . is short for self::node().
      return a.node('Axis', 'self', 'node');
    if ('..' === abbrStep)  // A location step of .. is short for parent::node()
      return a.node('Axis', 'parent', 'node');
 
    var axis = axisSpecifier(stream, a);
    var nodeType = nodeTypeTest(stream, a);
    var nodeName;
    if (null == nodeType) nodeName = nodeNameTest(stream, a);
    if (null == axis && null == nodeType && null == nodeName) return null;
    if (null == nodeType && null == nodeName)
        throw new XPathException(
            XPathException.INVALID_EXPRESSION_ERR,
            'Position ' + stream.position() +
            ': Expected nodeTest after axisSpecifier ' + axis);
    if (null == axis) axis = 'child';
    if (null == nodeType) {
      // When there's only a node name, then the node type is forced to be the
      // principal node type of the axis.
      // see http://www.w3.org/TR/xpath/#dt-principal-node-type
      if ('attribute' === axis) nodeType = 'attribute';
      else if ('namespace' === axis) nodeType = 'namespace';
      else nodeType = 'element';
    }
    var lhs = a.node('Axis', axis, nodeType, nodeName);
    var pred;
    while (null != (pred = predicate(lhs, stream, a))) {
      lhs = pred;
    }
    return lhs;
  }
  /** [5] AxisSpecifier::= AxisName '::' | AbbreviatedAxisSpecifier
   *  [6] AxisName::= 'ancestor' | 'ancestor-or-self' | 'attribute' | 'child'
   *                | 'descendant' | 'descendant-or-self' | 'following'
   *                | 'following-sibling' | 'namespace' | 'parent' |
   *                | 'preceding' | 'preceding-sibling' | 'self'
   *  [13] AbbreviatedAxisSpecifier::= '@'?
   */
  function axisSpecifier(stream, a) {
    var attr = stream.trypop('@');
    if (null != attr) return 'attribute';
    var axisName = stream.trypopaxisname();
    if (null != axisName) {
      var coloncolon = stream.trypop('::');
      if (null == coloncolon)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Should not happen. Should be ::.');
      return axisName;
    }
  }
  /** [7] NodeTest::= NameTest | NodeType '(' ')' | 'processing-instruction' '(' Literal ')'
   *  [38] NodeType::= 'comment' | 'text' | 'processing-instruction' | 'node'
   * I've split nodeTypeTest from nodeNameTest for convenience.
   */
  function nodeTypeTest(stream, a) {
    if ('(' !== stream.peek2()) {
      return null;
    }
    var type = stream.trypop(['comment', 'text', 'processing-instruction', 'node']);
    if (null != type) {
      if (null == stream.trypop('('))
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Should not happen.');
      var param = undefined;
      if (type == 'processing-instruction') {
        param = stream.trypopliteral();
      }
      if (null == stream.trypop(')'))
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected close parens.');
      return type
    }
  }
  function nodeNameTest(stream, a) {
    var name = stream.trypopnametest();
    if (name != null) return name;
    else return null;
  }
  /** [8] Predicate::= '[' PredicateExpr ']'
   *  [9] PredicateExpr::= Expr
   */
  function predicate(lhs, stream, a) {
    if (null == stream.trypop('[')) return null;
    var expr = orExpr(stream, a);
    if (null == expr)
      throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                               'Position ' + stream.position() +
                               ': Expected expression after [');
    if (null == stream.trypop(']'))
      throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                               'Position ' + stream.position() +
                               ': Expected ] after expression.');
    return a.node('Predicate', lhs, expr);
  }
  /** [14] Expr::= OrExpr
   */
  /** [15] PrimaryExpr::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall
   * e.g. $x,  (3+4),  "hi",  32,  f(x)
   */
  function primaryExpr(stream, a) {
    var x = stream.trypopliteral();
    if (null == x)
      x = stream.trypopnumber();
    if (null != x) {
      return x;
    }
    var varRef = stream.trypopvarref();
    if (null != varRef) return a.node('VariableReference', varRef);
    var funCall = functionCall(stream, a);
    if (null != funCall) {
      return funCall;
    }
    if (stream.trypop('(')) {
      var e = orExpr(stream, a);
      if (null == e)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected expression after (.');
      if (null == stream.trypop(')'))
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected ) after expression.');
      return e;
    }
    return null;
  }
  /** [16] FunctionCall::= FunctionName '(' ( Argument ( ',' Argument )* )? ')'
   *  [17] Argument::= Expr
   */
  function functionCall(stream, a) {
    var name = stream.trypopfuncname(stream, a);
    if (null == name) return null;
    if (null == stream.trypop('('))
      throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                               'Position ' + stream.position() +
                               ': Expected ( ) after function name.');
    var params = [];
    var first = true;
    while (null == stream.trypop(')')) {
      if (!first && null == stream.trypop(','))
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected , between arguments of the function.');
      first = false;
      var param = orExpr(stream, a);
      if (param == null)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected expression as argument of function.');
      params.push(param);
    }
    return a.node('FunctionCall', name, params);
  }
 
  /** [18] UnionExpr::= PathExpr | UnionExpr '|' PathExpr
   */
  function unionExpr(stream, a) { return binaryL(pathExpr, stream, a, '|'); }
  /** [19] PathExpr ::= LocationPath
   *                  | FilterExpr
   *                  | FilterExpr '/' RelativeLocationPath
   *                  | FilterExpr '//' RelativeLocationPath
   * Unlike most other nodes, this one always generates a node because
   * at this point all reverse nodesets must turn into a forward nodeset
   */
  function pathExpr(stream, a) {
    // We have to do FilterExpr before LocationPath because otherwise
    // LocationPath will eat up the name from a function call.
    var filter = filterExpr(stream, a);
    if (null == filter) {
      var loc = locationPath(stream, a);
      if (null == loc) {
        throw new Error
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': The expression shouldn\'t be empty...');
      }
      return a.node('PathExpr', loc);
    }
    var rel = relativeLocationPath(filter, stream, a, false);
    if (filter === rel) return rel;
    else return a.node('PathExpr', rel);
  }
  /** [20] FilterExpr::= PrimaryExpr | FilterExpr Predicate
   * aka. FilterExpr ::= PrimaryExpr Predicate*
   */
  function filterExpr(stream, a) {
    var primary = primaryExpr(stream, a);
    if (primary == null) return null;
    var pred, lhs = primary;
    while (null != (pred = predicate(lhs, stream, a))) {
      lhs = pred;
    }
    return lhs;
  }
 
  /** [21] OrExpr::= AndExpr | OrExpr 'or' AndExpr
   */
  function orExpr(stream, a) {
    var orig = (stream.peeked || '') + stream.str
    var r = binaryL(andExpr, stream, a, 'or');
    var now = (stream.peeked || '') + stream.str;
    return r;
  }
  /** [22] AndExpr::= EqualityExpr | AndExpr 'and' EqualityExpr
   */
  function andExpr(stream, a) { return binaryL(equalityExpr, stream, a, 'and'); }
  /** [23] EqualityExpr::= RelationalExpr | EqualityExpr '=' RelationalExpr
   *                     | EqualityExpr '!=' RelationalExpr
   */
  function equalityExpr(stream, a) { return binaryL(relationalExpr, stream, a, ['=','!=']); }
  /** [24] RelationalExpr::= AdditiveExpr | RelationalExpr '<' AdditiveExpr
   *                       | RelationalExpr '>' AdditiveExpr
   *                       | RelationalExpr '<=' AdditiveExpr
   *                       | RelationalExpr '>=' AdditiveExpr
   */
  function relationalExpr(stream, a) { return binaryL(additiveExpr, stream, a, ['<','>','<=','>=']); }
  /** [25] AdditiveExpr::= MultiplicativeExpr
   *                     | AdditiveExpr '+' MultiplicativeExpr
   *                     | AdditiveExpr '-' MultiplicativeExpr
   */
  function additiveExpr(stream, a) { return binaryL(multiplicativeExpr, stream, a, ['+','-']); }
  /** [26] MultiplicativeExpr::= UnaryExpr
   *                           | MultiplicativeExpr MultiplyOperator UnaryExpr
   *                           | MultiplicativeExpr 'div' UnaryExpr
   *                           | MultiplicativeExpr 'mod' UnaryExpr
   */
  function multiplicativeExpr(stream, a) { return binaryL(unaryExpr, stream, a, ['*','div','mod']); }
  /** [27] UnaryExpr::= UnionExpr | '-' UnaryExpr
   */
  function unaryExpr(stream, a) {
    if (stream.trypop('-')) {
      var e = unaryExpr(stream, a);
      if (null == e)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Expected unary expression after -');
      return a.node('UnaryMinus', e);
    }
    else return unionExpr(stream, a);
  }
  var astFactory = {
    node: function() {return Array.prototype.slice.call(arguments);}
  };
 
 
  /***************************************************************************
   *                            Optimizations (TODO)                         *
   ***************************************************************************/
  /**
   * Some things I've been considering:
   * 1) a//b becomes a/descendant::b if there's no predicate that uses
   *    position() or last()
   * 2) axis[pred]: when pred doesn't use position, evaluate it just once per
   *    node in the node-set rather than once per (node, position, last).
   * For more optimizations, look up Gecko's optimizer:
   * http://mxr.mozilla.org/mozilla-central/source/content/xslt/src/xpath/txXPathOptimizer.cpp
   */
  // TODO
  function optimize(ast) {
  }
 
  /***************************************************************************
   *                           Evaluation: axes                              *
   ***************************************************************************/
 
  /**
   * Data types: For string, number, boolean, we just use Javascript types.
   * Node-sets have the form
   *    {nodes: [node, ...]}
   * or {nodes: [node, ...], pos: [[1], [2], ...], lasts: [[1], [2], ...]}
   *
   * Most of the time, only the node is used and the position information is
   * discarded. But if you use a predicate, we need to try every value of
   * position and last in case the predicate calls position() or last().
   */
 
  /**
   * The NodeMultiSet is a helper class to help generate
   * {nodes:[], pos:[], lasts:[]} structures. It is useful for the
   * descendant, descendant-or-self, following-sibling, and
   * preceding-sibling axes for which we can use a stack to organize things.
   */
  function NodeMultiSet(isReverseAxis) {
    this.nodes = [];
    this.pos = [];
    this.lasts = [];
    this.nextPos = [];
    this.seriesIndexes = [];  // index within nodes that each series begins.
    this.isReverseAxis = isReverseAxis;
    this._pushToNodes = isReverseAxis ? Array.prototype.unshift : Array.prototype.push;
  }
  NodeMultiSet.prototype = {
    pushSeries: function pushSeries() {
      this.nextPos.push(1);
      this.seriesIndexes.push(this.nodes.length);
    },
    popSeries: function popSeries() {
      console.assert(0 < this.nextPos.length, this.nextPos);
      var last = this.nextPos.pop() - 1,
          indexInPos = this.nextPos.length,
          seriesBeginIndex = this.seriesIndexes.pop(),
          seriesEndIndex = this.nodes.length;
      for (var i = seriesBeginIndex; i < seriesEndIndex; ++i) {
        console.assert(indexInPos < this.lasts[i].length);
        console.assert(undefined === this.lasts[i][indexInPos]);
        this.lasts[i][indexInPos] = last;
      }
    },
    finalize: function() {
      if (null == this.nextPos) return this;
      console.assert(0 === this.nextPos.length);
      var lastsJSON = JSON.stringify(this.lasts);
      for (var i = 0; i < this.lasts.length; ++i) {
        for (var j = 0; j < this.lasts[i].length; ++j) {
          console.assert(null != this.lasts[i][j], i + ',' + j + ':' + lastsJSON);
        }
      }
      this.pushSeries = this.popSeries = this.addNode = function() {
        throw new Error('Already finalized.');
      };
      return this;
    },
    addNode: function addNode(node) {
      console.assert(node);
      this._pushToNodes.call(this.nodes, node)
      this._pushToNodes.call(this.pos, this.nextPos.slice());
      this._pushToNodes.call(this.lasts, new Array(this.nextPos.length));
      for (var i = 0; i < this.nextPos.length; ++i) this.nextPos[i]++;
    },
    simplify: function() {
      this.finalize();
      return {nodes:this.nodes, pos:this.pos, lasts:this.lasts};
    }
  };
  function eachContext(nodeMultiSet) {
    var r = [];
    for (var i = 0; i < nodeMultiSet.nodes.length; i++) {
      var node = nodeMultiSet.nodes[i];
      if (!nodeMultiSet.pos) {
        r.push({nodes:[node], pos: [[i + 1]], lasts: [[nodeMultiSet.nodes.length]]});
      } else {
        for (var j = 0; j < nodeMultiSet.pos[i].length; ++j) {
          r.push({nodes:[node], pos: [[nodeMultiSet.pos[i][j]]], lasts: [[nodeMultiSet.lasts[i][j]]]});
        }
      }
    }
    return r;
  }
  /** Matcher used in the axes.
   */
  function NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase) {
    this.nodeTypeNum = nodeTypeNum;
    this.nodeName = nodeName;
    this.shouldLowerCase = shouldLowerCase;
    this.nodeNameTest =
      null == nodeName ? this._alwaysTrue :
      shouldLowerCase ? this._nodeNameLowerCaseEquals :
      this._nodeNameEquals;
  }
  NodeMatcher.prototype = {
    matches: function matches(node) {
      if (0 === this.nodeTypeNum || this._nodeTypeMatches(node)) {
        return this.nodeNameTest(getNodeName(node));
      }
 
      return false;
    },
    _nodeTypeMatches(nodeOrAttr) {
      if (nodeOrAttr.constructor.name === 'Attr' && this.nodeTypeNum === 2) {
        return true;
      }
      return nodeOrAttr.nodeType === this.nodeTypeNum;
    },
    _alwaysTrue: function(name) {return true;},
    _nodeNameEquals: function _nodeNameEquals(name) {
      return this.nodeName === name;
    },
    _nodeNameLowerCaseEquals: function _nodeNameLowerCaseEquals(name) {
      return this.nodeName === name.toLowerCase();
    }
  };
 
  function followingSiblingHelper(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase, shift, peek, followingNode, andSelf, isReverseAxis) {
    var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
    var nodeMultiSet = new NodeMultiSet(isReverseAxis);
    while (0 < nodeList.length) {  // can be if for following, preceding
      var node = shift.call(nodeList);
      console.assert(node != null);
      node = followingNode(node);
      nodeMultiSet.pushSeries();
      var numPushed = 1;
      while (null != node) {
        if (! andSelf && matcher.matches(node))
          nodeMultiSet.addNode(node);
        if (node === peek.call(nodeList)) {
          shift.call(nodeList);
          nodeMultiSet.pushSeries();
          numPushed++;
        }
        if (andSelf && matcher.matches(node))
          nodeMultiSet.addNode(node);
        node = followingNode(node);
      }
      while (0 < numPushed--)
        nodeMultiSet.popSeries();
    }
    return nodeMultiSet;
  }
 
  /** Returns the next non-descendant node in document order.
   * This is the first node in following::node(), if node is the context.
   */
  function followingNonDescendantNode(node) {
    if (node.ownerElement) {
      if (node.ownerElement.firstChild)
        return node.ownerElement.firstChild;
      node = node.ownerElement;
    }
    do {
      if (node.nextSibling) return node.nextSibling;
    } while (node = node.parentNode);
    return null;
  }
 
  /** Returns the next node in a document-order depth-first search.
   * See the definition of document order[1]:
   *   1) element
   *   2) namespace nodes
   *   3) attributes
   *   4) children
   *   [1]: http://www.w3.org/TR/xpath/#dt-document-order
   */
  function followingNode(node) {
    if (node.ownerElement)  // attributes: following node of element.
      node = node.ownerElement;
    if (null != node.firstChild)
      return node.firstChild;
    do {
      if (null != node.nextSibling) {
        return node.nextSibling;
      }
      node = node.parentNode;
    } while (node);
    return null;
  }
  /** Returns the previous node in document order (excluding attributes
   * and namespace nodes).
   */
  function precedingNode(node) {
    if (node.ownerElement)
      return node.ownerElement;
    if (null != node.previousSibling) {
      node = node.previousSibling;
      while (null != node.lastChild) {
        node = node.lastChild;
      }
      return node;
    }
    if (null != node.parentNode) {
      return node.parentNode;
    }
    return null;
  }
  /** This axis is inefficient if there are many nodes in the nodeList.
   * But I think it's a pretty useless axis so it's ok. */
  function followingHelper(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
    var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
    var nodeMultiSet = new NodeMultiSet(false);
    var cursor = nodeList[0];
    var unorderedFollowingStarts = [];
    for (var i = 0; i < nodeList.length; i++) {
      var node = nodeList[i];
      var start = followingNonDescendantNode(node);
      if (start)
        unorderedFollowingStarts.push(start);
    }
    if (0 === unorderedFollowingStarts.length)
      return {nodes:[]};
    var pos = [], nextPos = [];
    var started = 0;
    while (cursor = followingNode(cursor)) {
      for (var i = unorderedFollowingStarts.length - 1; i >= 0; i--){
        if (cursor === unorderedFollowingStarts[i]) {
          nodeMultiSet.pushSeries();
          unorderedFollowingStarts.splice(i,i+1);
          started++;
        }
      }
      if (started && matcher.matches(cursor)) {
        nodeMultiSet.addNode(cursor);
      }
    }
    console.assert(0 === unorderedFollowingStarts.length);
    for (var i = 0; i < started; i++)
      nodeMultiSet.popSeries();
    return nodeMultiSet.finalize();
  }
  function precedingHelper(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
    var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
    var cursor = nodeList.pop();
    if (null == cursor) return {nodes:{}};
    var r = {nodes:[], pos:[], lasts:[]};
    var nextParents = [cursor.parentNode || cursor.ownerElement], nextPos = [1];
    while (cursor = precedingNode(cursor)) {
      if (cursor === nodeList[nodeList.length - 1]) {
        nextParents.push(nodeList.pop());
        nextPos.push(1);
      }
      var matches = matcher.matches(cursor);
      var pos, someoneUsed = false;
      if (matches)
        pos = nextPos.slice();
 
      for (var i = 0; i < nextParents.length; ++i) {
        if (cursor === nextParents[i]) {
          nextParents[i] = cursor.parentNode || cursor.ownerElement;
          if (matches) {
            pos[i] = null;
          }
        } else {
          if (matches) {
            pos[i] = nextPos[i]++;
            someoneUsed = true;
          }
        }
      }
      if (someoneUsed) {
        r.nodes.unshift(cursor);
        r.pos.unshift(pos);
      }
    }
    for (var i = 0; i < r.pos.length; ++i) {
      var lasts = [];
      r.lasts.push(lasts);
      for (var j = r.pos[i].length - 1; j >= 0; j--) {
        if (null == r.pos[i][j]) {
          r.pos[i].splice(j, j+1);
        } else {
          lasts.unshift(nextPos[j] - 1);
        }
      }
    }
    return r;
  }
 
  /** node-set, axis -> node-set */
  function descendantDfs(nodeMultiSet, node, remaining, matcher, andSelf, attrIndices, attrNodes) {
    while (0 < remaining.length && null != remaining[0].ownerElement) {
      var attr = remaining.shift();
      if (andSelf && matcher.matches(attr)) {
        attrNodes.push(attr);
        attrIndices.push(nodeMultiSet.nodes.length);
      }
    }
    if (null != node && !andSelf) {
      if (matcher.matches(node))
        nodeMultiSet.addNode(node);
    }
    var pushed = false;
    if (null == node) {
      if (0 === remaining.length) return;
      node = remaining.shift();
      nodeMultiSet.pushSeries();
      pushed = true;
    } else if (0 < remaining.length && node === remaining[0]) {
      nodeMultiSet.pushSeries();
      pushed = true;
      remaining.shift();
    }
    if (andSelf) {
      if (matcher.matches(node))
        nodeMultiSet.addNode(node);
    }
    // TODO: use optimization. Also try element.getElementsByTagName
    // var nodeList = 1 === nodeTypeNum && null != node.children ? node.children : node.childNodes;
    var nodeList = node.childNodes;
    for (var j = 0; j < nodeList.length; ++j) {
      var child = nodeList[j];
      descendantDfs(nodeMultiSet, child, remaining, matcher, andSelf, attrIndices, attrNodes);
    }
    if (pushed) {
      nodeMultiSet.popSeries();
    }
  }
  function descenantHelper(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase, andSelf) {
    var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
    var nodeMultiSet = new NodeMultiSet(false);
    var attrIndices = [], attrNodes = [];
    while (0 < nodeList.length) {
      // var node = nodeList.shift();
      descendantDfs(nodeMultiSet, null, nodeList, matcher, andSelf, attrIndices, attrNodes);
    }
    nodeMultiSet.finalize();
    for (var i = attrNodes.length-1; i >= 0; --i) {
      nodeMultiSet.nodes.splice(attrIndices[i], attrIndices[i], attrNodes[i]);
      nodeMultiSet.pos.splice(attrIndices[i], attrIndices[i], [1]);
      nodeMultiSet.lasts.splice(attrIndices[i], attrIndices[i], [1]);
    }
    return nodeMultiSet;
  }
  /**
   */
  function ancestorHelper(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase, andSelf) {
    var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
    var ancestors = []; // array of non-empty arrays of matching ancestors
    for (var i = 0; i < nodeList.length; ++i) {
      var node = nodeList[i];
      var isFirst = true;
      var a = [];
      while (null != node) {
        if (!isFirst || andSelf) {
          if (matcher.matches(node))
            a.push(node);
        }
        isFirst = false;
        node = node.parentNode || node.ownerElement;
      }
      if (0 < a.length)
        ancestors.push(a);
    }
    var lasts = [];
    for (var i = 0; i < ancestors.length; ++i) lasts.push(ancestors[i].length);
    var nodeMultiSet = new NodeMultiSet(true);
    var newCtx = {nodes:[], pos:[], lasts:[]};
    while (0 < ancestors.length) {
      var pos = [ancestors[0].length];
      var last = [lasts[0]];
      var node = ancestors[0].pop();
      for (var i = ancestors.length - 1; i > 0; --i) {
        if (node === ancestors[i][ancestors[i].length - 1]) {
          pos.push(ancestors[i].length);
          last.push(lasts[i]);
          ancestors[i].pop();
          if (0 === ancestors[i].length) {
            ancestors.splice(i, i+1);
            lasts.splice(i, i+1);
          }
        }
      }
      if (0 === ancestors[0].length) {
        ancestors.shift();
        lasts.shift();
      }
      newCtx.nodes.push(node);
      newCtx.pos.push(pos);
      newCtx.lasts.push(last);
    }
    return newCtx;
  }
  /** Helper function for sortDocumentOrder. Returns a list of indices, from the
   * node to the root, of positions within parent.
   * For convenience, the node is the first element of the array.
   */
  function addressVector(node) {
    var r = [node];
    if (null != node.ownerElement) {
      node = node.ownerElement;
      r.push(-1);
    }
    while (null != node) {
      var i = 0;
      while (null != node.previousSibling) {
        node = node.previousSibling;
        i++;
      }
      r.push(i);
      node = node.parentNode
    }
    return r;
  }
  function addressComparator(a, b) {
    var minlen = Math.min(a.length - 1, b.length - 1),  // not including [0]=node
        alen = a.length,
        blen = b.length;
    if (a[0] === b[0]) return 0;
    var c;
    for (var i = 0; i < minlen; ++i) {
      c = a[alen - i - 1] - b[blen - i - 1];
      if (0 !== c)
        break;
    }
    if (null == c || 0 === c) {
      // All equal until one of the nodes. The longer one is the descendant.
      c = alen - blen;
    }
    if (0 === c)
      c = getNodeName(a) - getNodeName(b);
    if (0 === c)
      c = 1;
    return c;
  }
  var sortUniqDocumentOrder = xpath.sortUniqDocumentOrder = function(nodes) {
    var a = [];
    for (var i = 0; i < nodes.length; i++) {
      var node = nodes[i];
      var v = addressVector(node);
      a.push(v);
    }
    a.sort(addressComparator);
    var b = [];
    for (var i = 0; i < a.length; i++) {
      if (0 < i && a[i][0] === a[i - 1][0])
        continue;
      b.push(a[i][0]);
    }
    return b;
  }
  /** Sort node multiset. Does not do any de-duping. */
  function sortNodeMultiSet(nodeMultiSet) {
    var a = [];
    for (var i = 0; i < nodeMultiSet.nodes.length; i++) {
      var v = addressVector(nodeMultiSet.nodes[i]);
      a.push({v:v, n:nodeMultiSet.nodes[i],
              p:nodeMultiSet.pos[i], l:nodeMultiSet.lasts[i]});
    }
    a.sort(compare);
    var r = {nodes:[], pos:[], lasts:[]};
    for (var i = 0; i < a.length; ++i) {
      r.nodes.push(a[i].n);
      r.pos.push(a[i].p);
      r.lasts.push(a[i].l);
    }
    function compare(x, y) {
      return addressComparator(x.v, y.v);
    }
    return r;
  }
  /** Returns an array containing all the ancestors down to a node.
   * The array starts with document.
   */
  function nodeAndAncestors(node) {
    var ancestors = [node];
    var p = node;
    while (p = p.parentNode || p.ownerElement) {
      ancestors.unshift(p);
    }
    return ancestors;
  }
  function compareSiblings(a, b) {
    if (a === b) return 0;
    var c = a;
    while (c = c.previousSibling) {
      if (c === b)
        return 1;  // b < a
    }
    c = b;
    while (c = c.previousSibling) {
      if (c === a)
        return -1;  // a < b
    }
    throw new Error('a and b are not siblings: ' + xpath.stringifyObject(a) + ' vs ' + xpath.stringifyObject(b));
  }
  /** The merge in merge-sort.*/
  function mergeNodeLists(x, y) {
    var a, b, aanc, banc, r = [];
    if ('object' !== typeof x)
      throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                               'Invalid LHS for | operator ' +
                               '(expected node-set): ' + x);
    if ('object' !== typeof y)
      throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                               'Invalid LHS for | operator ' +
                               '(expected node-set): ' + y);
    while (true) {
      if (null == a) {
        a = x.shift();
        if (null != a)
          aanc = addressVector(a);
      }
      if (null == b) {
        b = y.shift();
        if (null != b)
          banc = addressVector(b);
      }
      if (null == a || null == b) break;
      var c = addressComparator(aanc, banc);
      if (c < 0) {
        r.push(a);
        a = null;
        aanc = null;
      } else if (c > 0) {
        r.push(b);
        b = null;
        banc = null;
      } else if (getNodeName(a) < getNodeName(b)) {  // attributes
        r.push(a);
        a = null;
        aanc = null;
      } else if (getNodeName(a) > getNodeName(b)) {  // attributes
        r.push(b);
        b = null;
        banc = null;
      } else if (a !== b) {
        // choose b arbitrarily
        r.push(b);
        b = null;
        banc = null;
      } else {
        console.assert(a === b, c);
        // just skip b without pushing it.
        b = null;
        banc = null;
      }
    }
    while (a) {
      r.push(a);
      a = x.shift();
    }
    while (b) {
      r.push(b);
      b = y.shift();
    }
    return r;
  }
  function comparisonHelper(test, x, y, isNumericComparison) {
    var coersion;
    if (isNumericComparison)
      coersion = fn.number;
    else coersion =
      'boolean' === typeof x || 'boolean' === typeof y ? fn['boolean'] :
      'number' === typeof x || 'number' === typeof y ? fn.number :
      fn.string;
    if ('object' === typeof x && 'object' === typeof y) {
      var aMap = {};
      for (var i = 0; i < x.nodes.length; ++i) {
        var xi = coersion({nodes:[x.nodes[i]]});
        for (var j = 0; j < y.nodes.length; ++j) {
          var yj = coersion({nodes:[y.nodes[j]]});
          if (test(xi, yj)) return true;
        }
      }
      return false;
    } else if ('object' === typeof x && x.nodes && x.nodes.length) {
      for (var i = 0; i < x.nodes.length; ++i) {
        var xi = coersion({nodes:[x.nodes[i]]}), yc = coersion(y);
        if (test(xi, yc))
          return true;
      }
      return false;
    } else if ('object' === typeof y && x.nodes && x.nodes.length) {
      for (var i = 0; i < x.nodes.length; ++i) {
        var yi = coersion({nodes:[y.nodes[i]]}), xc = coersion(x);
        if (test(xc, yi))
          return true;
      }
      return false;
    } else {
      var xc = coersion(x), yc = coersion(y);
      return test(xc, yc);
    }
  }
  var axes = xpath.axes = {
    'ancestor':
      function ancestor(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return ancestorHelper(
          nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase, false);
      },
    'ancestor-or-self':
      function ancestorOrSelf(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return ancestorHelper(
          nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase, true);
      },
    'attribute':
      function attribute(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        // TODO: figure out whether positions should be undefined here.
        var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
        var nodeMultiSet = new NodeMultiSet(false);
        if (null != nodeName) {
          // TODO: with namespace
          for (var i = 0; i < nodeList.length; ++i) {
            var node = nodeList[i];
            if (null == node.getAttributeNode)
              continue;  // only Element has .getAttributeNode
            var attr = node.getAttributeNode(nodeName);
            if (null != attr && matcher.matches(attr)) {
              nodeMultiSet.pushSeries();
              nodeMultiSet.addNode(attr);
              nodeMultiSet.popSeries();
            }
          }
        } else {
          for (var i = 0; i < nodeList.length; ++i) {
            var node = nodeList[i];
            if (null != node.attributes) {
              nodeMultiSet.pushSeries();
              for (var j = 0; j < node.attributes.length; j++) {  // all nodes have .attributes
                var attr = node.attributes[j];
                if (matcher.matches(attr))  // TODO: I think this check is unnecessary
                  nodeMultiSet.addNode(attr);
              }
              nodeMultiSet.popSeries();
            }
          }
        }
        return nodeMultiSet.finalize();
      },
    'child':
      function child(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
        var nodeMultiSet = new NodeMultiSet(false);
        for (var i = 0; i < nodeList.length; ++i) {
          var n = nodeList[i];
          if (n.ownerElement)  // skip attribute nodes' text child.
            continue;
          if (n.childNodes) {
            nodeMultiSet.pushSeries();
            var childList = 1 === nodeTypeNum && null != n.children ?
                n.children : n.childNodes;
            for (var j = 0; j < childList.length; ++j) {
              var child = childList[j];
              if (matcher.matches(child)) {
                nodeMultiSet.addNode(child);
              }
              // don't have to do de-duping because children have parent,
              // which are current context.
            }
            nodeMultiSet.popSeries();
          }
        }
        nodeMultiSet.finalize();
        return sortNodeMultiSet(nodeMultiSet);
      },
    'descendant':
      function descenant(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return descenantHelper(
          nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase, false);
      },
    'descendant-or-self':
      function descenantOrSelf(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return descenantHelper(
          nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase, true);
      },
    'following':
      function following(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return followingHelper(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase);
      },
    'following-sibling':
      function followingSibling(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return followingSiblingHelper(
          nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase,
          Array.prototype.shift, function() {return this[0];},
          function(node) {return node.nextSibling;});
      },
    'namespace':
      function namespace(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        // TODO
      },
    'parent':
      function parent(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
        var nodes = [], pos = [];
        for (var i = 0; i < nodeList.length; ++i) {
          var parent = nodeList[i].parentNode || nodeList[i].ownerElement;
          if (null == parent)
            continue;
          if (!matcher.matches(parent))
            continue;
          if (nodes.length > 0 && parent === nodes[nodes.length-1])
            continue;
          nodes.push(parent);
          pos.push([1]);
        }
        return {nodes:nodes, pos:pos, lasts:pos};
      },
    'preceding':
      function preceding(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return precedingHelper(
          nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase);
      },
    'preceding-sibling':
      function precedingSibling(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        return followingSiblingHelper(
          nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase,
          Array.prototype.pop, function() {return this[this.length-1];},
          function(node) {return node.previousSibling},
          false, true);
      },
    'self':
      function self(nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase) {
        var nodes = [], pos = [];
        var matcher = new NodeMatcher(nodeTypeNum, nodeName, shouldLowerCase);
        for (var i = 0; i < nodeList.length; ++i) {
          if (matcher.matches(nodeList[i])) {
            nodes.push(nodeList[i]);
            pos.push([1]);
          }
        }
        return {nodes: nodes, pos: pos, lasts: pos}
      }
  };
 
  /***************************************************************************
   *                         Evaluation: functions                           *
   ***************************************************************************/
  var fn = {
    'number': function number(optObject) {
      if ('number' === typeof optObject)
        return optObject;
      if ('string' === typeof optObject)
        return parseFloat(optObject);  // note: parseFloat(' ') -> NaN, unlike +' ' -> 0.
      if ('boolean' === typeof optObject)
        return +optObject;
      return fn.number(fn.string.call(this, optObject));  // for node-sets
    },
    'string': function string(optObject) {
      if (null == optObject)
        return fn.string(this);
      if ('string' === typeof optObject || 'boolean' === typeof optObject ||
          'number' === typeof optObject)
        return '' + optObject;
      if (0 == optObject.nodes.length) return '';
      if (null != optObject.nodes[0].textContent)
        return optObject.nodes[0].textContent;
      return optObject.nodes[0].nodeValue;
    },
    'boolean': function booleanVal(x) {
      return 'object' === typeof x ? x.nodes.length > 0 : !!x;
    },
    'last': function last() {
      console.assert(Array.isArray(this.pos));
      console.assert(Array.isArray(this.lasts));
      console.assert(1 === this.pos.length);
      console.assert(1 === this.lasts.length);
      console.assert(1 === this.lasts[0].length);
      return this.lasts[0][0];
    },
    'position': function position() {
      console.assert(Array.isArray(this.pos));
      console.assert(Array.isArray(this.lasts));
      console.assert(1 === this.pos.length);
      console.assert(1 === this.lasts.length);
      console.assert(1 === this.pos[0].length);
      return this.pos[0][0];
    },
    'count': function count(nodeSet) {
      if ('object' !== typeof nodeSet)
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Position ' + stream.position() +
                                 ': Function count(node-set) ' +
                                 'got wrong argument type: ' + nodeSet);
      return nodeSet.nodes.length;
    },
    'id': function id(object) {
      var r = {nodes: []};
      var doc = this.nodes[0].ownerDocument || this.nodes[0];
      console.assert(doc);
      var ids;
      if ('object' === typeof object) {
        // for node-sets, map id over each node value.
        ids = [];
        for (var i = 0; i < object.nodes.length; ++i) {
          var idNode = object.nodes[i];
          var idsString = fn.string({nodes:[idNode]});
          var a = idsString.split(/[ \t\r\n]+/g);
          Array.prototype.push.apply(ids, a);
        }
      } else {
        var idsString = fn.string(object);
        var a = idsString.split(/[ \t\r\n]+/g);
        ids = a;
      }
      for (var i = 0; i < ids.length; ++i) {
        var id = ids[i];
        if (0 === id.length)
          continue;
        var node = doc.getElementById(id);
        if (null != node)
          r.nodes.push(node);
      }
      r.nodes = sortUniqDocumentOrder(r.nodes);
      return r;
    },
    'local-name': function(nodeSet) {
      if (null == nodeSet)
        return fn.name(this);
      if (null == nodeSet.nodes) {
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'argument to name() must be a node-set. got ' + nodeSet);
      }
      // TODO: namespaced version
      return nodeSet.nodes[0].localName;
    },
    'namespace-uri': function(nodeSet) {
      // TODO
      throw new Error('not implemented yet');
    },
    'name': function(nodeSet) {
      if (null == nodeSet)
        return fn.name(this);
      if (null == nodeSet.nodes) {
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'argument to name() must be a node-set. got ' + nodeSet);
      }
      return nodeSet.nodes[0].name;
    },
    'concat': function concat(x) {
      var l = [];
      for (var i = 0; i < arguments.length; ++i) {
        l.push(fn.string(arguments[i]));
      }
      return l.join('');
    },
    'starts-with': function startsWith(a, b) {
      var as = fn.string(a), bs = fn.string(b);
      return as.substr(0, bs.length) === bs;
    },
    'contains': function contains(a, b) {
      var as = fn.string(a), bs = fn.string(b);
      var i = as.indexOf(bs);
      if (-1 === i) return false;
      return true;
    },
    'substring-before': function substringBefore(a, b) {
      var as = fn.string(a), bs = fn.string(b);
      var i = as.indexOf(bs);
      if (-1 === i) return '';
      return as.substr(0, i);
    },
    'substring-after': function substringBefore(a, b) {
      var as = fn.string(a), bs = fn.string(b);
      var i = as.indexOf(bs);
      if (-1 === i) return '';
      return as.substr(i + bs.length);
    },
    'substring': function substring(string, start, optEnd) {
      if (null == string || null == start) {
        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                 'Must be at least 2 arguments to string()');
      }
      var sString = fn.string(string),
          iStart = fn.round(start),
          iEnd = optEnd == null ? null : fn.round(optEnd);
      // Note that xpath string positions user 1-based index
      if (iEnd == null)
        return sString.substr(iStart - 1);
      else
        return sString.substr(iStart - 1, iEnd);
    },
    'string-length': function stringLength(optString) {
      return fn.string.call(this, optString).length;
    },
    'normalize-space': function normalizeSpace(optString) {
      var s = fn.string.call(this, optString);
      return s.replace(/[ \t\r\n]+/g, ' ').replace(/^ | $/g, '');
    },
    'translate': function translate(string, from, to) {
      var sString = fn.string.call(this, string),
          sFrom = fn.string(from),
          sTo = fn.string(to);
      var eachCharRe = [];
      var map = {};
      for (var i = 0; i < sFrom.length; ++i) {
        var c = sFrom.charAt(i);
        map[c] = sTo.charAt(i);  // returns '' if beyond length of sTo.
        // copied from goog.string.regExpEscape in the Closure library.
        eachCharRe.push(
          c.replace(/([-()\[\]{}+?*.$\^|,:#<!\\])/g, '\\$1').
            replace(/\x08/g, '\\x08'));
      }
      var re = new RegExp(eachCharRe.join('|'), 'g');
      return sString.replace(re, function(c) {return map[c];});
    },
    /// Boolean functions
    'not': function not(x) {
      var bx = fn['boolean'](x);
      return !bx;
    },
    'true': function trueVal() { return true; },
    'false': function falseVal() { return false; },
    // TODO
    'lang': function lang(string) { throw new Error('Not implemented');},
    'sum': function sum(optNodeSet) {
      if (null == optNodeSet) return fn.sum(this);
      // for node-sets, map id over each node value.
      var sum = 0;
      for (var i = 0; i < optNodeSet.nodes.length; ++i) {
        var node = optNodeSet.nodes[i];
        var x = fn.number({nodes:[node]});
        sum += x;
      }
      return sum;
    },
    'floor': function floor(number) {
      return Math.floor(fn.number(number));
    },
    'ceiling': function ceiling(number) {
      return Math.ceil(fn.number(number));
    },
    'round': function round(number) {
      return Math.round(fn.number(number));
    }
  };
  /***************************************************************************
   *                         Evaluation: operators                           *
   ***************************************************************************/
  var more = {
    UnaryMinus: function(x) { return -fn.number(x); },
    '+': function(x, y) { return fn.number(x) + fn.number(y); },
    '-': function(x, y) { return fn.number(x) - fn.number(y); },
    '*': function(x, y) { return fn.number(x) * fn.number(y); },
    'div': function(x, y) { return fn.number(x) / fn.number(y); },
    'mod': function(x, y) { return fn.number(x) % fn.number(y); },
    '<': function(x, y) {
      return comparisonHelper(function(x, y) { return fn.number(x) < fn.number(y);}, x, y, true);
    },
    '<=': function(x, y) {
      return comparisonHelper(function(x, y) { return fn.number(x) <= fn.number(y);}, x, y, true);
    },
    '>':  function(x, y) {
      return comparisonHelper(function(x, y) { return fn.number(x) > fn.number(y);}, x, y, true);
    },
    '>=': function(x, y) {
      return comparisonHelper(function(x, y) { return fn.number(x) >= fn.number(y);}, x, y, true);
    },
    'and': function(x, y) { return fn['boolean'](x) && fn['boolean'](y); },
    'or': function(x, y) { return fn['boolean'](x) || fn['boolean'](y); },
    '|': function(x, y) { return {nodes: mergeNodeLists(x.nodes, y.nodes)}; },
    '=': function(x, y) {
      // optimization for two node-sets case: avoid n^2 comparisons.
      if ('object' === typeof x && 'object' === typeof y) {
        var aMap = {};
        for (var i = 0; i < x.nodes.length; ++i) {
          var s = fn.string({nodes:[x.nodes[i]]});
          aMap[s] = true;
        }
        for (var i = 0; i < y.nodes.length; ++i) {
          var s = fn.string({nodes:[y.nodes[i]]});
          if (aMap[s]) return true;
        }
        return false;
      } else {
        return comparisonHelper(function(x, y) {return x === y;}, x, y);
      }
    },
    '!=': function(x, y) {
      // optimization for two node-sets case: avoid n^2 comparisons.
      if ('object' === typeof x && 'object' === typeof y) {
        if (0 === x.nodes.length || 0 === y.nodes.length) return false;
        var aMap = {};
        for (var i = 0; i < x.nodes.length; ++i) {
          var s = fn.string({nodes:[x.nodes[i]]});
          aMap[s] = true;
        }
        for (var i = 0; i < y.nodes.length; ++i) {
          var s = fn.string({nodes:[y.nodes[i]]});
          if (!aMap[s]) return true;
        }
        return false;
      } else {
        return comparisonHelper(function(x, y) {return x !== y;}, x, y);
      }
    }
  };
  var nodeTypes = xpath.nodeTypes = {
    'node': 0,
    'attribute': 2,
    'comment': 8, // this.doc.COMMENT_NODE,
    'text': 3, // this.doc.TEXT_NODE,
    'processing-instruction': 7, // this.doc.PROCESSING_INSTRUCTION_NODE,
    'element': 1  //this.doc.ELEMENT_NODE
  };
  /** For debugging and unit tests: returnjs a stringified version of the
   * argument. */
  var stringifyObject = xpath.stringifyObject = function stringifyObject(ctx) {
    var seenKey = 'seen' + Math.floor(Math.random()*1000000000);
    return JSON.stringify(helper(ctx));
 
    function helper(ctx) {
      if (Array.isArray(ctx)) {
        return ctx.map(function(x) {return helper(x);});
      }
      if ('object' !== typeof ctx) return ctx;
      if (null == ctx) return ctx;
    //  if (ctx.toString) return ctx.toString();
      if (null != ctx.outerHTML) return ctx.outerHTML;
      if (null != ctx.nodeValue) return ctx.nodeName + '=' + ctx.nodeValue;
      if (ctx[seenKey]) return '[circular]';
      ctx[seenKey] = true;
      var nicer = {};
      for (var key in ctx) {
        if (seenKey === key)
          continue;
        try {
          nicer[key] = helper(ctx[key]);
        } catch (e) {
          nicer[key] = '[exception: ' + e.message + ']';
        }
      }
      delete ctx[seenKey];
      return nicer;
    }
  }
  var Evaluator = xpath.Evaluator = function Evaluator(doc) {
    this.doc = doc;
  }
  Evaluator.prototype = {
    val: function val(ast, ctx) {
      console.assert(ctx.nodes);
 
      if ('number' === typeof ast || 'string' === typeof ast) return ast;
      if (more[ast[0]]) {
        var evaluatedParams = [];
        for (var i = 1; i < ast.length; ++i) {
          evaluatedParams.push(this.val(ast[i], ctx));
        }
        var r = more[ast[0]].apply(ctx, evaluatedParams);
        return r;
      }
      switch (ast[0]) {
        case 'Root': return {nodes: [this.doc]};
        case 'FunctionCall':
          var functionName = ast[1], functionParams = ast[2];
          if (null == fn[functionName])
            throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
                                     'Unknown function: ' + functionName);
          var evaluatedParams = [];
          for (var i = 0; i < functionParams.length; ++i) {
            evaluatedParams.push(this.val(functionParams[i], ctx));
          }
          var r = fn[functionName].apply(ctx, evaluatedParams);
          return r;
        case 'Predicate':
          var lhs = this.val(ast[1], ctx);
          var ret = {nodes: []};
          var contexts = eachContext(lhs);
          for (var i = 0; i < contexts.length; ++i) {
            var singleNodeSet = contexts[i];
            var rhs = this.val(ast[2], singleNodeSet);
            var success;
            if ('number' === typeof rhs) {
              success = rhs === singleNodeSet.pos[0][0];
            } else {
              success = fn['boolean'](rhs);
            }
            if (success) {
              var node = singleNodeSet.nodes[0];
              ret.nodes.push(node);
              // skip over all the rest of the same node.
              while (i+1 < contexts.length && node === contexts[i+1].nodes[0]) {
                i++;
              }
            }
          }
          return ret;
        case 'PathExpr':
          // turn the path into an expressoin; i.e., remove the position
          // information of the last axis.
          var x = this.val(ast[1], ctx);
          // Make the nodeset a forward-direction-only one.
          if (x.finalize) {  // it is a NodeMultiSet
            return {nodes: x.nodes};
          } else {
            return x;
          }
        case '/':
          // TODO: don't generate '/' nodes, just Axis nodes.
          var lhs = this.val(ast[1], ctx);
          console.assert(null != lhs);
          var r = this.val(ast[2], lhs);
          console.assert(null != r);
          return r;
        case 'Axis':
          // All the axis tests from Step. We only get AxisSpecifier NodeTest,
          // not the predicate (which is applied later)
          var axis = ast[1],
              nodeType = ast[2],
              nodeTypeNum = nodeTypes[nodeType],
              shouldLowerCase = true,  // TODO: give option
              nodeName = ast[3] && shouldLowerCase ? ast[3].toLowerCase() : ast[3];
          nodeName = nodeName === '*' ? null : nodeName;
          if ('object' !== typeof ctx) return {nodes:[], pos:[]};
          var nodeList = ctx.nodes.slice();  // TODO: is copy needed?
          var r = axes[axis](nodeList  /*destructive!*/, nodeTypeNum, nodeName, shouldLowerCase);
          return r;
      }
    }
  };
  var evaluate = xpath.evaluate = function evaluate(expr, doc, context) {
    //var astFactory = new AstEvaluatorFactory(doc, context);
    var stream = new Stream(expr);
    var ast = parse(stream, astFactory);
    var val = new Evaluator(doc).val(ast, {nodes: [context]});
    return val;
  }
 
  /***************************************************************************
   *                           DOM interface                                 *
   ***************************************************************************/
  var XPathException = xpath.XPathException = function XPathException(code, message) {
    var e = new Error(message);
    e.name = 'XPathException';
    e.code = code;
    return e;
  }
  XPathException.INVALID_EXPRESSION_ERR = 51;
  XPathException.TYPE_ERR = 52;
 
 
  var XPathEvaluator = xpath.XPathEvaluator = function XPathEvaluator() {}
  XPathEvaluator.prototype = {
    createExpression: function(expression, resolver) {
      return new XPathExpression(expression, resolver);
    },
    createNSResolver: function(nodeResolver) {
      // TODO
    },
    evaluate: function evaluate(expression, contextNode, resolver, type, result) {
      var expr = new XPathExpression(expression, resolver);
      return expr.evaluate(contextNode, type, result);
    }
  };
 
 
  var XPathExpression = xpath.XPathExpression = function XPathExpression(expression, resolver, optDoc) {
    var stream = new Stream(expression);
    this._ast = parse(stream, astFactory);
    this._doc = optDoc;
  }
  XPathExpression.prototype = {
    evaluate: function evaluate(contextNode, type, result) {
      if (null == contextNode.nodeType)
        throw new Error('bad argument (expected context node): ' + contextNode);
      var doc = contextNode.ownerDocument || contextNode;
      if (null != this._doc && this._doc !== doc) {
        throw new core.DOMException(
            core.DOMException.WRONG_DOCUMENT_ERR,
            'The document must be the same as the context node\'s document.');
      }
      var evaluator = new Evaluator(doc);
      var value = evaluator.val(this._ast, {nodes: [contextNode]});
      if (XPathResult.NUMBER_TYPE === type)
        value = fn.number(value);
      else if (XPathResult.STRING_TYPE === type)
        value = fn.string(value);
      else if (XPathResult.BOOLEAN_TYPE === type)
        value = fn['boolean'](value);
      else if (XPathResult.ANY_TYPE !== type &&
               XPathResult.UNORDERED_NODE_ITERATOR_TYPE !== type &&
               XPathResult.ORDERED_NODE_ITERATOR_TYPE !== type &&
               XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE !== type &&
               XPathResult.ORDERED_NODE_SNAPSHOT_TYPE !== type &&
               XPathResult.ANY_UNORDERED_NODE_TYPE !== type &&
               XPathResult.FIRST_ORDERED_NODE_TYPE !== type)
        throw new core.DOMException(
            core.DOMException.NOT_SUPPORTED_ERR,
            'You must provide an XPath result type (0=any).');
      else if (XPathResult.ANY_TYPE !== type &&
               'object' !== typeof value)
        throw new XPathException(
            XPathException.TYPE_ERR,
            'Value should be a node-set: ' + value);
      return new XPathResult(doc, value, type);
    }
  }
 
  var XPathResult = xpath.XPathResult = function XPathResult(doc, value, resultType) {
    this._value = value;
    this._resultType = resultType;
    this._i = 0;
 
    // TODO: we removed mutation events but didn't take care of this. No tests fail, so that's nice, but eventually we
    // should fix this, preferably by entirely replacing our XPath implementation.
    // this._invalidated = false;
    // if (this.resultType === XPathResult.UNORDERED_NODE_ITERATOR_TYPE ||
    //     this.resultType === XPathResult.ORDERED_NODE_ITERATOR_TYPE) {
    //   doc.addEventListener('DOMSubtreeModified', invalidate, true);
    //   var self = this;
    //   function invalidate() {
    //     self._invalidated = true;
    //     doc.removeEventListener('DOMSubtreeModified', invalidate, true);
    //   }
    // }
  }
  XPathResult.ANY_TYPE = 0;
  XPathResult.NUMBER_TYPE = 1;
  XPathResult.STRING_TYPE = 2;
  XPathResult.BOOLEAN_TYPE = 3;
  XPathResult.UNORDERED_NODE_ITERATOR_TYPE = 4;
  XPathResult.ORDERED_NODE_ITERATOR_TYPE = 5;
  XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE = 6;
  XPathResult.ORDERED_NODE_SNAPSHOT_TYPE = 7;
  XPathResult.ANY_UNORDERED_NODE_TYPE = 8;
  XPathResult.FIRST_ORDERED_NODE_TYPE = 9;
  var proto = {
    // XPathResultType
    get resultType() {
      if (this._resultType) return this._resultType;
      switch (typeof this._value) {
        case 'number': return XPathResult.NUMBER_TYPE;
        case 'string': return XPathResult.STRING_TYPE;
        case 'boolean': return XPathResult.BOOLEAN_TYPE;
        default: return XPathResult.UNORDERED_NODE_ITERATOR_TYPE;
      }
    },
    get numberValue() {
      if (XPathResult.NUMBER_TYPE !== this.resultType)
        throw new XPathException(XPathException.TYPE_ERR,
                                 'You should have asked for a NUMBER_TYPE.');
      return this._value;
    },
    get stringValue() {
      if (XPathResult.STRING_TYPE !== this.resultType)
        throw new XPathException(XPathException.TYPE_ERR,
                                 'You should have asked for a STRING_TYPE.');
      return this._value;
    },
    get booleanValue() {
      if (XPathResult.BOOLEAN_TYPE !== this.resultType)
        throw new XPathException(XPathException.TYPE_ERR,
                                 'You should have asked for a BOOLEAN_TYPE.');
      return this._value;
    },
    get singleNodeValue() {
      if (XPathResult.ANY_UNORDERED_NODE_TYPE !== this.resultType &&
          XPathResult.FIRST_ORDERED_NODE_TYPE !== this.resultType)
        throw new XPathException(
            XPathException.TYPE_ERR,
            'You should have asked for a FIRST_ORDERED_NODE_TYPE.');
      return this._value.nodes[0] || null;
    },
    get invalidIteratorState() {
      if (XPathResult.UNORDERED_NODE_ITERATOR_TYPE !== this.resultType &&
          XPathResult.ORDERED_NODE_ITERATOR_TYPE !== this.resultType)
        return false;
      return !!this._invalidated;
    },
    get snapshotLength() {
      if (XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE !== this.resultType &&
          XPathResult.ORDERED_NODE_SNAPSHOT_TYPE !== this.resultType)
        throw new XPathException(
            XPathException.TYPE_ERR,
            'You should have asked for a ORDERED_NODE_SNAPSHOT_TYPE.');
      return this._value.nodes.length;
    },
    iterateNext: function iterateNext() {
      if (XPathResult.UNORDERED_NODE_ITERATOR_TYPE !== this.resultType &&
          XPathResult.ORDERED_NODE_ITERATOR_TYPE !== this.resultType)
        throw new XPathException(
            XPathException.TYPE_ERR,
            'You should have asked for a ORDERED_NODE_ITERATOR_TYPE.');
      if (this.invalidIteratorState)
        throw new core.DOMException(
            core.DOMException.INVALID_STATE_ERR,
            'The document has been mutated since the result was returned');
      return this._value.nodes[this._i++] || null;
    },
    snapshotItem: function snapshotItem(index) {
      if (XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE !== this.resultType &&
          XPathResult.ORDERED_NODE_SNAPSHOT_TYPE !== this.resultType)
        throw new XPathException(
            XPathException.TYPE_ERR,
            'You should have asked for a ORDERED_NODE_SNAPSHOT_TYPE.');
      return this._value.nodes[index] || null;
    }
  };
  // so you can access ANY_TYPE etc. from the instances:
  XPathResult.prototype = Object.create(XPathResult,
      Object.keys(proto).reduce(function (descriptors, name) {
        descriptors[name] = Object.getOwnPropertyDescriptor(proto, name);
        return descriptors;
      }, {
        constructor: {
          value: XPathResult,
          writable: true,
          configurable: true
        }
      }));
 
  core.XPathException = XPathException;
  core.XPathExpression = XPathExpression;
  core.XPathResult = XPathResult;
  core.XPathEvaluator = XPathEvaluator;
 
  core.Document.prototype.createExpression =
    XPathEvaluator.prototype.createExpression;
 
  core.Document.prototype.createNSResolver =
      XPathEvaluator.prototype.createNSResolver;
 
  core.Document.prototype.evaluate = XPathEvaluator.prototype.evaluate;
 
  return xpath; // for tests
};